How to Paint Interior Doors Like a Professional
- LA Dzintars
- 4 days ago
- 11 min read
Key Takeaways
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A tired old door can drag down a whole room, but a fresh coat of paint can turn it into a real focal point. The secret to painting interior doors that look like a professional did them comes down to good prep, the right paint, and a bit of patience between coats. Whether you have flat slab doors or doors with raised panels, the steps are pretty much the same.
At Letts Paint, we've worked on homes all across Ottawa, and we know the local climate can make a difference in how paint cures and dries. That's why we want to walk you through interior door painting the right way, from cleaning and sanding to picking a finish that will hold up to daily use. You'll learn what tools work best and how to avoid the drips and brush marks that give away a rushed job.
By the end of this guide, you'll have a clear plan for tackling your own interior door painting project, no matter your skill level. We'll cover the common mistakes homeowners make so you can skip them entirely and get a smooth, even finish on your first try.
Common Interior Door Types Found in Ottawa Homes
Before you pick up a paintbrush, it helps to know what kind of door you're working with. Ottawa homes have a mix of door styles, and each one takes paint a little differently.
Hollow-Core Molded Doors
You'll find hollow-core molded doors in most newer Ottawa homes and condos. They have a thin wood or fibreboard skin over a honeycomb cardboard core, which makes them light and affordable.
These doors are moulded to look like they have raised panels, but the surface is smooth and often made of pressed wood. Paint goes on easily since the surface is flat and even.
Just be careful with sanding, since you can wear through the thin outer layer if you're not gentle. A light touch and good primer will help your paint job last.
Raised Panel Solid-Core Doors
Raised panel solid-core doors are heavier and sturdier than hollow-core options. They're built with a solid wood or engineered wood core, which gives them a solid feel when you knock on them.
The door panels on these doors are raised, meaning they stick out from the frame around them. This creates shadow lines and texture that add character to a room.
When you paint these doors, take your time with the paneled doors first before moving to the flat parts. This order helps you avoid drips and uneven coverage in the grooves.
Flat Slab Doors
Flat slab doors have a smooth, flat surface with no panels or grooves at all. You'll often see these in modern flush door designs used throughout many newer Ottawa homes and condos.
Their simple look works well in contemporary spaces where clean lines matter. Painting a flat slab door is one of the easier jobs, since there are no grooves or details to work around.
You can use a roller for most of the surface and a brush for the edges. This combination gives you a smooth, even finish without much extra effort.
Traditional Wood Doors
Traditional wood doors are common in Ottawa's older neighbourhoods and heritage homes. They're made from solid wood like oak, pine, or maple, and many have detailed panel doors with visible wood grain.
These doors often need more prep work before painting, especially if they have old layers of paint or varnish. You may need to sand down rough spots or fill in small dents and scratches.
Solid wood doors can be heavy, so it helps to have another person around if you plan to take the door off its hinges. Once prepped properly, these doors hold paint well and can last for years.
French Doors
French doors stand out because of their glass panels set inside a wood frame. You'll often see them connecting living rooms to dining rooms or leading into home offices in Ottawa homes.
Painting French doors takes more patience since you need to tape off the glass carefully. A steady hand and good painter's tape will help you get clean, straight lines along the wood edges.
Because these interior French doors let light pass between rooms, a fresh coat of paint can really brighten up the space. Take your time around the glass, and the results will look sharp.
Preparation: The Key to a Professional Finish
Before you pick up a brush, good surface preparation is what separates a smooth, lasting paint job from one that peels and chips within a year. At Letts Paint, we always tell our Ottawa clients that a little extra time spent prepping your doors pays off with a professional-looking finish.
Remove Hardware
Start by taking off all the door hardware, including doorknobs, hinges, and any locks or handles. This step protects your hardware from paint splatters and lets you get an even coat across the whole surface.
Use a screwdriver to remove hinge pins and set the door on a pair of sawhorses so you can work on it flat. Keep small screws and pins in a labelled bag so you don't lose them.
If your door has a lot of trim near the door casing or door frame, this is also a good time to check whether painter's tape will be needed for those areas. Taking hardware off almost always looks better than trying to paint around it.
Clean Thoroughly
Doors collect dust, grease, and fingerprints over time, and paint won't stick well over any of that. Wipe the door down with a mild soap and water solution, then dry it completely before moving on.
For kitchen or bathroom doors with grease buildup, a cloth dampened with mineral spirits can help cut through the residue. Lay down a drop cloth underneath to catch drips and protect your floors while you clean.
Once the door is dry, run a tack cloth over the surface to pick up any leftover dust or lint. This small step makes a noticeable difference to paint adhesion, so it's worth doing even when the door looks clean.
Sand the Surface
Sanding gives the paint something to grip onto, which helps it last longer without chipping. Start with a medium-grit sandpaper to knock down any old paint texture, then switch to a finer grit for a smooth finish.
A sanding sponge works well for curved panels or edges where flat paper can't reach. Sand in the direction of the wood grain, and try to keep pressure light and even across the whole door.
After sanding, wipe the door down again with a tack cloth to remove dust before you touch any paint or primer. Skipping this step often leaves a rough, gritty finish that shows up once the paint dries.
Repair Imperfections
Take a close look at the door for dents, scratches, or small holes before you paint. Wood filler is the easiest way to fix these spots, since it dries hard and sands smooth.
Apply the filler with a putty knife, then let it dry fully before sanding it level with the rest of the door. For any loose edges or old caulk that needs trimming, a utility knife can help you get a clean line.
Check the door casing and frame too, since these areas often get overlooked. Fixing imperfections now means your finished paint job will look even and free of bumps or dips.
Prime When Needed
Primer isn't always required, but it makes a real difference on bare wood, stained surfaces, or doors that are changing colour dramatically. It helps the paint go on smoother and improves paint adhesion overall.
If you're painting over a dark colour with a lighter one, primer helps prevent the old colour from showing through. Apply it evenly with a brush or roller, and let it dry fully before adding your first coat of paint.
For more detailed guidance on when priming makes the biggest impact, The Home Depot's guide to painting interior doors is a helpful resource. Skipping primer on the wrong surface can lead to uneven colour and a finish that wears out faster than it should.
Painting Methods
You can paint your interior doors using a few different tools, and each one gives a slightly different finish. Picking the right method for your door and paint type will help you get smooth results without a lot of extra work.
Woven Roller Application
A woven roller is a good choice if you want an even coat with a bit of texture. These rollers hold a lot of paint, so you won't need to reload your paint roller as often.
Pour your paint into a paint tray and roll off any extra before you start. This helps you avoid drips and heavy spots.
Work in small sections and keep a wet edge as you go. This means you should paint into the last section before it dries so you don't get lines where the sections meet.
Woven rollers work best on flat door panels. For grooves or edges, you'll want to switch to a brush.
Foam Roller Application
A foam roller gives you a smoother finish than a woven roller. This makes it a great pick for doors where you want a clean, flat look, like on modern flush doors.
Foam rollers spread paint in thin coats, which helps you avoid a bumpy texture. Dip the roller into your paint tray and roll off extra paint before applying it to the door.
Move the roller in one direction first, then go over it lightly in the other direction to even things out. This helps blend the paint so you don't see roller marks once it dries.
Foam rollers work well with both latex and oil based paints. Just check your paint can to see what type of roller the maker suggests.
Brush and Roller Combination
Using a brush and roller together gives you the best of both tools. This method works well because most interior doors have flat areas along with grooves, panels, or trim.
Start with an angled brush to paint the edges, corners, and any grooves. An angled brush gives you more control in tight spots and helps you avoid getting paint on the door frame.
Once the edges are done, switch to your roller for the larger flat sections. This combination helps you get full coverage without leaving brush marks on the open areas.
Many painters use this method for panelled doors, since it lets you paint every part evenly. Just make sure to blend the brush and roller sections together while the paint is still wet.
Spray Painting Interior Doors
A paint sprayer gives you the smoothest finish of any method, with no brush or roller marks at all. This is why many pros use a sprayer for a factory-like finish, as noted by Bob Vila's painting guide.
Spraying works best when the door is off its hinges and laid flat or set up on a stand. This gives you full access to every side and edge.
Apply thin coats and keep the sprayer moving at a steady pace. Moving too slowly in one spot can cause the paint to pool or run.
Always check the drying time between coats before adding a second coat of paint. Spraying without enough drying time can cause the paint to look uneven or feel tacky once it's fully dry.
Choosing the Right Paint
The paint you choose for your interior doors will affect how smooth the finish looks and how well it holds up to daily use. Your two main choices are latex paint or oil-based paint, and each has its own strengths when it comes to durability and finish quality.
At Letts Paint, we recommend latex-based or acrylic paint for most interior doors in Ottawa homes. Water-based paints dry faster, clean up easily with soap and water, and have less odour than oil-based options. They also hold their colour well over time and resist yellowing, which matters if you're going with a crisp white or a bold shade like black doors.
Oil-based paint is still worth considering if you want an extra hard, smooth finish. It self-levels nicely, which hides brush strokes better than most latex paints. The trade-off is a longer dry time and stronger fumes, so you'll want good ventilation while you work.
For quality, look at brands like Benjamin Moore Advance, which combines the durability of oil-based paint with the easy cleanup of water-based formulas. Sherwin-Williams ProClassic is another favourite among painters for its smooth, furniture-like finish on doors and trim.
Recommended Sheens
Sheen matters just as much as the type of paint you pick. For interior doors, we usually suggest a satin or semi-gloss finish because they hold up to fingerprints, smudges, and regular cleaning.
Satin paint gives a soft, low-shine look that hides small dents or imperfections in older doors. Gloss finish paint, on the other hand, gives doors a shiny, polished look that highlights trim details but can also show more surface flaws.
If your door sees a lot of daily traffic, like in a hallway or kids' room, semi-gloss or gloss paint tends to be the more practical choice. For quieter spaces, satin finish paint offers a nice balance between durability and a softer appearance.
Common Interior Door Painting Mistakes
Painting a door looks simple, but a few small slip-ups can leave you with a finish that looks less than professional. Here at Letts Paint, we've seen the same mistakes trip up homeowners across Ottawa time and time again.
Skipping prep work is the biggest culprit. If you skip sanding or cleaning, your paint won't stick properly, and you'll notice it later.
Using the wrong tools or technique often leads to visible brush marks. A quality brush or foam roller, paired with light, even strokes, gives you a much smoother finish without visible brush marks.
Another issue is working too slowly between sections. This causes lap marks, which are those uneven streaks where wet paint overlaps paint that's already started to dry. To avoid this, try to:
Work in small sections and keep a "wet edge"
Apply paint quickly but evenly
Avoid going back over areas that are already drying
Rushing the drying time between coats is another common error. Doors get touched a lot, so give each coat enough time to cure before adding another or reinstalling the hardware.
Ignoring the type of door material can also cause problems. Wood, MDF, and glass doors all behave differently, so it helps to choose the right paint for your door type before you start.
Finally, painting doors while they're still hanging can make it tricky to get an even coat on all edges. Taking the door off its hinges usually gives you better access and a more even result.
Conclusion
Painting your interior doors is a simple way to give your home a fresh new look. You don't need fancy tools or years of experience to get great results.
Just remember the basics:
Clean and sand your door first
Use painter's tape to protect the hardware and hinges
Choose a good quality paint made for doors and trim
Apply thin, even coats and let each one dry fully
Take your time and don't rush the process
If you follow these steps, your doors should look smooth and neat for years to come.
At Letts Paint, we know that even small projects like this can feel like a lot of work. If you'd rather leave it to the experts, our Ottawa painting team is always happy to help.
We understand which paints and techniques hold up best in our neighbourhood homes. Whether you want to tackle the job yourself or have us take care of it for you, a fresh coat of colour on your doors can make a big difference.
Your home deserves that extra bit of care and attention. So grab your brush, or give us a call, and enjoy the difference a freshly painted door can make.
With Letts Paint
Painting your interior doors is a great weekend project. But if you're short on time, or you just want a flawless finish without the hassle, we're happy to help.
At Letts Paint, we know how to give your doors that smooth, professional look. No brush marks, no drips, no mess for you to clean up.
Here's what you get when you work with us:
Expert prep work – sanding, cleaning, and priming done right
Durable, high-quality paint built to handle daily wear and tear
A tidy job site – we treat your home like our own
Friendly, local service right here in Ottawa
We've painted doors, trim, and walls in homes all across our neighbourhood, and we'd love to add yours to the list.
Whether you need one door refreshed or your whole house repainted, our team is ready to bring colour and life back into your space.
Ready to skip the ladder and the paint trays?
Contact Letts Paint today for a free quote. We'll walk you through your options, help you pick the perfect colour, and get the job done on your schedule.
Your doors deserve a little love. Let's make them shine.
