A pro guide to painting moulding – the best way for a smooth finish on trim

Ensure smooth results when painting moulding and trim yourself with our 7-step guide to DIY like a professional.

Ladder in white room with ornate trim ceiling
(Image credit: Getty Images)

While painting moulding and trim in your home might not have as dramatic an effect as painting walls, it is amazing how a fresh coat of paint on interior woodwork like skirting boards and architrave will smarten up your interiors and really show off the colour on your walls.

How you approach the job of painting trim around your ceiling, walls, windows and doors will very much depend on whether you are working with bare timber, or wood that has been previously painted. But, the over all finish you can achieve is totally worth it. DIY for a more budget-friendly but super satisfying home improvement.

Do you paint trim first or last?

Some recommend painting moulding before the walls as it's easier to tape and protect than the wall however, this could actually be more hassle (and mess) than it's worth and we'd recommend painting trim after your walls and ceiling are painted. Kaitlin Madden, Global Editor-in-Chief of Real Homes and savvy DIYer always paints skirting boards and other room trim last. 'I always do them after because I feel like it's easier not to get trim paint on walls than it is not to get wall paint on trim, since the wall paint can drip down on the trim.'

What kind of paint do you use on moulding?

Before you begin, consider the finish you want to achieve as different paint types will result in different looks, the best and most popular paint options for moulding include:

  • Gloss paint: As the name suggest this is a high gloss paint for a shiny finish. It has fallen out of favour recently, with many preferring matt finishes as gloss can highlight brushstrokes and imperfections. It wipes down well making it practical for kitchens or bathrooms, but can take a long time to dry when you paint.
  • Satin paint: Somewhere between gloss and a matt finish, satin paint tends to be wore hardwearing and easier to wipe down than matt finishes. It offers a soft sheen finish.
  • Eggshell: Eggshell is nearly matt in finish, but more durable than a flat matt emulsion. It works well on cupboards and doors as it is easy to work with and keep clean.

How to paint moulding

You will need:

  • Protective eye wear
  • Dust sheets/old bed cloths
  • High-quality paint brush (the width/around the same size as the moulding)
  • Masking/frog tape
  • A clean cloth/damp sponge
  • Knotting pale
  • Wood primer
  • Your paint of choice
  • No-load sandpaper 80/100/120 grit
  • Wood filler & caulk

Painting trim white

(Image credit: Getty Images)

1. Prepare the area

You will first need to remove or cover furniture that is near or around the woodwork, and also your floors — a dustsheet or old bed sheet is the easiest way to do this. It is also wise to use masking/frog tape between the trim to be painted and the walls and floor it runs up to.

2. Treat softwood mouldings with knotting solution

Begin by applying a knotting solution to softwood mouldings. This prevents sap from leaking out and into your paint finish. 

3. Sand down the trim

You could be tempted to skip this part but, sanding will help the primer and paint absorb well into the grain for a smooth and neat trim finish. At this point, the wood can then be sanded using whichever level grit sandpaper is best for the job: if the woodwork is already pretty smooth use 120-grit and if it's coarse choose 80-grit to start with. Clean it up smooth and blended with a cloth.

4. Fill any cracks and dents

Any screw holes and dents should be filled with wood filler, before the cracks between the wall and the woodwork are filled with caulk and allowed to dry. 

5. Sand again

To smooth the surface again, give mouldings a light once over again with 120-grit sandpaper.

6. Prime mouldings

Primer is the key to a neat and professional looking finish when painting trim. Use a wood primer, applying it use a high-quality paintbrush of a thickness that suits the wood moulding you are painting. Depending on the product you use, you may not need to apply a separate undercoat.

7. Start on the topcoat

With the primer/undercoats fully dry you can move on to the topcoat. Work with the grain of the wood and avoid temptation to overload your brush. Depending on how many coats of primer you used and whether or not you used an undercoat, you may only need to apply one coat.

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(Image credit: Chris Snook)

Can I paint over painted trim?

If you're repainting trim then start by assessing the condition of the existing paint. If it is peeling very badly you might need to use a paint stripper and solution or heat gun to remove what remains. Care should be taken with both methods in terms of protecting surrounding furniture and floors, as well as your skin. You will need to wear gloves and a mask and if there is a chance that the paint might be lead-based you should seek the advice of a professional. Otherwise, there should be no need to remove all of the existing paint, and a light sanding will be all that is required to provide a good key for the new paint. 

  1. Clean the surface with sugar soap.
  2. When dry apply an undercoat/primer — one application should be enough.
  3. Finally, finish with your chosen paint, priming beforehand and following the same method as for bare wood. 

How do you paint trim neatly? 

Here are our top tips to get a crisp finish when painting mouldings, without a brushstroke or drip in sight:

  • Cut in edges: Cut in with paint as you would on walls for more precision.
  • Don't overload your brush: Use the slap technique when filling up your brush to remove excess paint, rather than wiping as this just pushes the paint to the centre of the brush leading to drips. 
  • Never overlap: Avoid uneven marks by not working in the paint too much and by not starting to paint, over an already painted area.
  • Brush off the surface: With each stroke, start in an unpainted area but work in towards painted sections, ensuring you brush off with each stroke to lay off the paint neatly.
  • Watch your edges: Never brush across an edge as drips will be likely. Paint towards or along edges to avoid buildup.
  • Rollers vs. brushes when painting trim: Use a small high-density foam paint roller if you want to make this a quick job however, you will most certainly still need a paint brush for touch ups so be aware of that!

Painting in a home

(Image credit: Amazon)

Painted trim like a pro.

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