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Exterior FAQs

Preparation for your exterior painting project...

While it is true that there are lots of different types of paintable surface the “Three Musts” always apply.                                                   

  1. The surface must be dry,
  2. The surface must be clean
  3. The surface must be sound.

A good start is half the work!  Obeying the “Three Musts” is the only way to ensure a good paint job and while the first two are self-explanatory the third “Must” means that ALL loose or flaking material must be removed before you begin painting.


All colours in the Colourtrend Weather Collection may be applied by brush, roller or spray. Always stabilise powdery masonry with Colourtrend Weather Stabilising Primer, which gives you the perfect base for painting. Ensure you treat any mould or algal growth with Colourtrend Weather Fungicidal Wash before painting.


Colourtrend Gloss and Satinwood should be applied with a brush for best results. When painting exterior woodwork always prime bare wood with a wood primer and treat knots or resinous wood with a knotting solution. Fill cracks and holes with a good quality exterior filler and rub down when dry.

Questions asked by you, answered by us…

Starting out to paint or repaint an entire house, a whole room - or even an exterior window frame that needs a little tender loving care - can be somewhat daunting. 

That's why Colourtrend invited a panel of painting and decorating experts to listen to your problems and take your questions on board.  Take a scroll through some of the answers we've already provided to Colourtrend users over the years - it may well be that your question is already answered!

But if it's not, then don't hesitate - If you cannot find the answer to your question please contact us.

  1. Bubbles or foaming paint
  2. Painting chimneys
  3. Cracked and chipping paint
  4. Decking
  5. Metal doors
  6. Mildew
  7. Roof coating
  8. Chalking
  9. Exterior wood
  10. Garden Sheds

Bubbles or foaming

Question: I am repainting the exterior of my house at the moment with Colourtrend Weather Exterior Masonry Paint in the colour called Union Mills.  The existing window trim is painted teak. In some areas I am installing new teak as the originals are quite weathered. I primed the new wood with two coats of an all-purpose primer and then applied a first coat of a high quality waterbased gloss paint.

The problem I am having is that bubbles form as I am applying the paint. I am using a quality nylon brush and only stirred the paint with a wood paddle (slowly). The bubbles eventually pop as the paint dries, but they leave small surface imperfections and rings. I have been told that this is common in such a rough textured surface.

I would like to know if there is way to prevent the formation of the bubbles.

Answer: If you thin the paint a little bit, with 100mls per 5 litres of paint, the paint will flow into the rough teak more readily, and the bubbles will break more quickly.

Also, try pre-dampening the area with water just before applying the paint. Apply the water with a paint brush then blot off the excess with a rag, before applying the paint. Using one or both of these approaches should solve your problem.

Chimney Painting

Question: What is the easiest way to prepare and paint my chimney?

Answer: Here are some key steps to priming and painting your chimney

1. Surface to be painted should be clean, dry and free from dirt and grease. Remove all loose and flaking paint. Previously painted surfaces should be thoroughly washed down, rinsed with clean water and allowed to dry.

2. Areas affected with micro-biological growth should be treated with Colourtrend Weather Fungicidal Wash. Allow up to 3 days for fungicide to take full effect, then power wash with water to remove the residue.

3. Surfaces that remain powdery after thorough preparation should be primed with Colourtrend Weather Stabilising Primer.

4. Where necessary, wipe down with a damp, lint free cloth to avoid dust. Surface defects should be filled with the appropriate filler - we recommend Allpro or Toupret filler.

5. Colourtrend Weather Exterior Masonry Paint can then be applied to the surface using a brush or roller. 4-6 hours drying time should be allowed before applying the second coat.

Cracked and Chipping Paintwork

Question: Our front porch ceiling looks as if it was previously painted with varnish. The house is 75-80 years old, and the ceiling looks as if it is "tongue-in-groove".  The old finish is generally cracked and chipping everywhere. Do you recommend redoing it with varnish? I like the look of the wood, and really would rather redo it that way. Do you recommend sanding to bare wood?

Answer: Unfortunately, the answer is ‘yes’ - for best results you will have to remove the old varnish.  Rather than simply sanding it, start by scraping... it sounds like it is brittle enough so as to not take too much effort.  Set up platforms so you can conveniently reach the ceiling. Purchase a large scraper that takes two hands to use, and scrape the flat surfaces going down the boards, not across. Use a shaped (e.g., triangular) scraper to work in the beading or grooves. Wear safety goggles, and a quality dust mask: not a "comfort mask".

Once you have finished the scraping, sand the surfaces with medium grit sandpaper, again going with the grain, not across. Dust off thoroughly, and apply two coats of Colourtrend Woodcare Transparent Deck Stain. This is an extremely durable stain for use on wood, decking and fencing. This stain will highlight the full beauty of the wood grain and provide deep-penetrating wood protection.

As Colourtrend Woodcare Transparent Deck Stain is waterbased, it is very low odour and is fast drying - particularly when compared to standard strong smelling, solvent-based wood stains.  It’s available in five beautiful shades too [link to woodcare page]


Question: I have a new cedar deck and would like to keep the colour but would like to protect it in the best possible way...What should I use?

Answer: Colourtrend Woodcare Original Timber Oil is a translucent oil treatment for cedar, mahogany, teak and other premium exotic hardwood surfaces. It can be used for decks and outdoor furniture.

This oil brings out the full beauty of the wood grain and provides deep-penetrating wood protection. It contains a blend of superb-grade linseed oil for maximum penetration, long-oil alkyds for durability and pure tung oil for colour depth and water repellence. In addition, complex translucent iron oxide pigments and UV stabilisers which are added to ensure a lasting UV absorbing surface rich with colour.

This product can also be used on all types of premium softwoods, such as red and white cedar, redwood, fir, and even pressure-treated wood. Proper surface preparation is the key to maximum finish performance. The durability of this product can be impaired by an unsound or poorly prepared surface. It is very important the surface be clean of all dirt, mildew, loose wood fibres and other foreign matter. Surfaces must be structurally sound and absolutely dry.

Metal Doors

Question: I recently painted an exterior steel door using waterbased paint. I used a quality brush but still ended up with brush marks. I have 6 more doors to paint and really want a smooth finish. How do I achieve this?

Answer: To get the best possible flow follow these steps:

1. Be sure the surface is clean and free of all oily dirt by cleaning and rinsing with warm water and any household detergent. Sand all areas that are at all glossy to promote adhesion of the new paint.

2. Prime the metal surface using Sustain Guard 11 One-for-All Anti-Corrosive Metal Primer.  This is a high solids acrylic primer developed for use on various metal substrates. This product offers excellent adhesion and anticorrosive protection when applied onto both ferrous and non ferrous metals such as mild steel, aluminium and galvanised surfaces. Sustain Guard 11 gives excellent resistance to humidity, salts spray, flash rusting and chemical exposure.

3. Use a quality polyester brush, apply the paint in heavy coats, and do not keep brushing each area... fewer strokes are better. The quality of the brush is important for getting as few brushmarks as possible.

4. The paint may be thinned a little first – max of an eggcup measure of water per litre. Too much thinning will result in sagging (‘curtaining’ or ‘drooping’ of the paint).

5. If possible, remove the doors and place them on saw horses for painting. This way, you can apply a heavy coat with good flow and you don't have to be concerned about sagging.

6. Apply the paint heavily, and with just a few strokes, then get more paint from the tin and continue. First stroke is from the just painted area into the dry (unpainted) area, and the second stoke is back into the painted area. Go onto the next area. Putting the paint on heavier will help it flow out.


Question: Should my entire house be washed down with a bleach solution before painting? Only my northern side has some small pockets of mildew.

Answer: No, there’s no need.  Treat only the mildewed areas with a bleach solution. Use 3:1 blend of water : household bleach mixture. Leave the mixture on the mildew for 20 minutes, adding more as it dries. Wear eye protection and rubber gloves, and rinse the treated area thoroughly with clean water.

Roof Coating

Question: My roof tiles are concrete and are looking tired and weather-beaten. I have just recently painted the exterior of my house using Colourtrend Weather Exterior Masonry Paint in Palest Ochum and I feel my roof is ruining the great-looking makeover I’ve given the rest of the house! Can you help me?

Answer: Colourtrend Weather Roof Coat is designed as a high performance decorative and protective coating system for slate or sheet asbestos and concrete tile roofs. The coating has excellent resistance to water including acid rain, alkali, common pollutants and UV light. The product is also designed to be easy to use and fast drying.

It cannot be over-emphasised that thorough roof surface preparation is essential in order to achieve satisfactory results. Indeed, unless surfaces are adequately cleaned, it is not advised to apply this coating.  The surface must be clean and dry before application, and free from all organic growths, dirt, grime, dust, etc. before painting.   For more detailed information please click here [link to Roof Coat data sheet pdf]


Question: My house seems to have a chalky coating over it. It is not completely over all the masonry, but it is in quite a few places. How do you recommend that I get rid of this?

Answer: Chalking is usually due to natural weathering. The simplest way of removing the chalk is to brush the masonry down with a wire brush and then rinse well, either with a high pressured hose or for best results with a power washer.

When completed, use Colourtrend Weather Stabilising Primer, a high performance primer to aid the adhesion properties of coatings to substrates.  Colourtrend Weather Stabilising Primer seals highly absorbent substrates such as masonry and ceramic surfaces, so there is an even surface for over-coating.  This will seal off any remaining chalk. Apply Colourtrend Weather Stabilising Primer with a brush or roller for best results.

When dry, apply two coats of Colourtrend Weather Exterior Masonry Paint in the colour of your choice.

Exterior Wood

Question: I own a small-fronted sweet shop in the middle of town. The outside gets quite a bit of traffic and I would like to paint the wood with a product that will retain its bright colour while having extra durability. What do you recommend?

Answer: We recommend Colourtrend Gloss.

Previously painted surfaces should be lightly sanded and then cleaned down with water.  Any surface to be painted should be clean, dry and free from dirt or grease.  Then apply one coat of Colourtrend Undercoat to your clean previously painted wood or your fresh unpainted wood, followed by two coats of Colourtrend Gloss in your chosen colour.

Garden Sheds

Question: In anticipation of warmer brighter days, I want to paint my garden shed in a bright quirky colour to give a different look and to adorn my garden. What do you recommend I use for this?

Answer: Colourtrend Solid Colour Wood Stain is an extremely durable exterior stain for use on wood decking, wooden cladding and siding, fences, fascias and soffits, outdoor furniture, railings and cement patios, steps and walkways.  This innovative formula will resist scuffing and oil and grease will wash off easily with soapy water. Colourtrend Solid Colour Wood Stain is ideal for use on most types of timber including red deal, cedar, teak, mahogany, cypress, pine and fir, as well as pressure treated wood.

Proper surface preparation is the key to achieve maximum finish performance and the durability of this product will be added to even more with a perfectly prepared surface.  Surfaces must be structurally sound and absolutely dry. Previously painted surfaces should be scrubbed with Colourtrend Woodcare Deck Clean and a stiff bristle brush to remove all loose fibres, dirt, chalky residue, flaking paint or stain, mildew and other foreign matter.  Power washing is also effective.

This product requires 2 coats in your chosen bright colour and should be allowed to dry for 4-6 hours between coats.  Colourtrend Solid Colour Wood Stain can be applied using brush, spray or roller.