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Peeling & flaking paint

Exterior paintwork flaking

We live in a 1930’s white rendered house. Three years ago we employed a painter and decorator (£1,300 labour, plus materials) to paint the render and black woodwork. Unfortunately after only three years all the woodwork is flaking and the render is absorbing rainwater which in some areas has started to show through in the interior.

Can only assume poor quality paint or inadequate coverage is the root of the problem. Any advice on quality paint and preparation would be welcome as we are considering doing the job ourselves?

Mandy

Answer

Early failure of the paint coating on the woodwork is likely a result of poor preparation and/or excessive use of thinners. You’ll need to remove any loose or flaking paint, thoroughly rub-down all surfaces and start afresh with a decent quality exterior paint system such as Dulux Weathershield. This is quite expensive when compared to regular primer, undercoat and gloss paints but it has been formulated especially for exterior use and will usually perform much better.

Ingress of water via the rendered walls is difficult to diagnose and can be the result of a number of factors including minor surface damage/cracks and/or trapped moisture. It is difficult to say whether poor paint quality or lack of preparation has caused this problem but an extreme example could be that your painter has used an all-weather coating over an already damp surface in order to get the job done quickly and this has prevented the wall from drying out?

Regular water-based masonry paints are moisture vapour permeable and will allow minor patches of damp to dry out over time; all-weather coatings do not have this property as they are intended for use on sound surfaces when poor weather conditions make the use of water based paints impractical.

In any case you’ll need to ensure that any minor surface damage has been repaired and any damp has thoroughly dried out before repainting. Most brands of exterior masonry paint are perfectly adequate for the job if used properly.


Peeling paint on brickwork

We have recently bought a semi detached 1950s (ex council) property, the bricks have been painted over the years with several layers of paint-I’m not sure what sorts altogether.

The paint is peeling off in areas, some areas just the top layers, other areas are back to brick and in these brick areas there does look to be patches of white (I think it may be salts from all my reading?).

So the question is what do we do, we would like to do a proper job not just another cover up which is what seems to have happened in the past.

Margaret

Answer

You often find with these situations there are a number of reasons why the paint has failed. The bare bricks and white patches are a clear sign of trapped moisture but this may, as you suggest, be isolated to small areas. The paint failure elsewhere may be just the result of poor preparation and workmanship?

The bare patches should indicate the source of any inherent damp problem. For instance, if it’s around windows/doors it could be just defective mastics which are easily rectified. You can also get damp patches under windows where the sill isn’t shedding rainfall away from the wall. Again, this can be a simple fix.

Once you’ve allowed these patches to dry out in depth you should be OK to repaint with a good brand of water based masonry paint, thinning the first coat so it soaks in a little.

The bad news is that even if you rectify any problems and scrape off any loose paint it’s unlikely your first attempt at repainting will be the end of the matter. Existing paint that looks firmly attached now could start to flake over time – the added load of a new coat or two of paint can often accelerate the process too. Unfortunately, you may have to repeat the process again at a later date.


Suspected lack of undercoat

Had my staircase painted last July & the gloss has started to peel off . I asked the decorator in question to undercoat, but am now wondering if he just slapped gloss on old gloss as you can see the old yellow gloss.

What do you think? Would appreciate your opinion

Anon

Answer

It seems likely you are right, painting staircase spindles is a labour-intensive job and one where it’s common for short-cuts to be taken.

If you can actually peel the new paint off then this is a clear indication that there has been little or no preparation done beforehand.

Question

I had my exterior woodwork painted at the end of September into October 2018. It is now flaking in most areas. The paint used was a Sandtex water based product.

The painter has said the problem is probably a result of the wrong time of year, due to a cold snap in October and November being particularly cold. Is this explanation likely and what is the best paint to use?

Nina B

Answer

Hi Nina

The primary reason that paint flakes-off in this manner is due to a lack of preparation, especially when using water-based products on top of an existing oil-based finish.

It is essential that all surfaces are properly washed down to remove any grease or contamination, then all surfaces must be thoroughly rubbed down to provide an adequate ‘key’ for subsequent coats to grip on to.

With exterior work especially, this is something that’s easily skimped on because a lot of the work is at height and not easily inspected.

Your painter is correct in so far as the time of year being less than ideal but, if the works were carried out correctly, this wouldn’t lead to the problems you are now experiencing.

Hope that helps?


14 thoughts on “Peeling & flaking paint”

  1. I have some manky floorboards in my bathroom, and want to paint them in a way that the coating can be scrubbed whenever. I’ve already used Quick Drying Satinwood, and this has flaked off whilst cleaning. Should I use Acrylic based or Solvent based satinwood, or eggshell on them?

    • It sounds like the satinwood you’ve applied has not adhered to the wood and this is why it’s flaking. Satinwood is not very ‘scrubbable’ anyway so it is likely a combination of inadequate preparation and the wrong choice of finish.

      Ideally, you should ensure the floorboards are free of any greasy residue before painting and then prime the wood with a regular oil-based wood primer. Then coat with a 2 coats oil-based eggshell or an undercoat and gloss finish. Even then you’d need to allow the paint a few weeks to fully harden before attempting to scrub the surface.

      Obviously, since the floor has already been painted, you’re going to experience further problems with the paint flaking since whatever you do now is only going to be as good as the surface it’s applied to.

  2. I have decorated my flat with a light-grey emulsion. The paint on the bathroom walls is flaking… probably due to condensation. I have been advised to use a scraper; then to sand the walls; then to use an oil-based undercoat before emulsioning. Questions: Is that information correct? Can I use my water-based emulsion on top of the oil-based undercoat?

    • That’s duff information Jerry. You should use a thinned-down coat of the emulsion you’re planning to finish with.

      The reason the paint is flaking can be down to a number of reasons but using an oil-based primer is going to solve none of these.

  3. Our new build of 6 years (semi townhouse)had wooden factory sprayed windows throughout, after 5 years, the paint started to flake, some going down to grey bare wood. our wooden front porch also started to crack, chip and flake. A painter came out last September and repainted all the windows, porch and patio door+ step. We are now seeing patches of flaking on the step, patches of bare wood(grey)on some of the window edges and sills and flaking and cracking on the porch……….he used Johnstones Aqua water based satin paint and was advised to use this by Johnstones in Ipswich. He is coming round this afternoon to look. Please can you recommend what is a better and more long lasting type of paint; we are very exposed to the elements here, high winds, rain and sun for the majority of the day. Thank you Jane

  4. Just had decorators in and both ceiling and walls peeling due to new build company not painting correctly.

    So now going to see if company will put right.

    • Ask for the specification for the work that was done and what measures were taken to ensure the spec was followed.

      These kind of works are often not specified correctly and, where they are, there isn’t much checking going on. Decorators are often paid on price and will skimp preparation wherever possible. As you’re finding, it can take a long time for lack of preparation to be apparent.

  5. I’m currently preparing my first house for painting / emulsioning. I’m scraping off the old paint and sanding filling where appropriate. The difficulty is the old paint is coming off, do I need to scrap off all the paint from all the walls? I fell this will take a very long time but want a nice finish.
    Is there an easier way?

    • Anything you put on the walls is only ever going to be as good as the surface you apply it to. So, short answer, yes you need to scrape off any loose paint.

      If you have a wall where some of the paint is loose and some is firmly stuck (as is usually the case) you may find it easier to line the walls with a 1000 grade lining paper to get a nice smooth finish rather than to try and level all the edges with filler.

      Is there an easy way? No, welcome to the world of decorating.

  6. Hi I am redecorating a bathroom and have noticed that the previous paint has a hairline cracked appearance to it . I was told to sand it down and apply an oil based primer and then an oil based topcoat
    Would this solve the problem of the cracks?

    • It’s difficult to say exactly what the problem is, without seeing it first hand, but the common cause for this effect, particularly in bathrooms, is that paint has been applied directly to the wall without it being thoroughly cleaned beforehand.

      The method you describe may work to an extent (although you’ll need to use a filler between coats to cover the cracks) because oil based paints dry harder and it is possible to sand down to a smoother finish but it really does depend how bad the surface contamination is to start with?

      Another method you may want to try is to use a lining paper to cover the walls and then paint over that. You’ll need to thoroughly clean the walls first and sand down to remove any glossy surfaces. Then use a heavy duty adhesive like this. Allow to dry for at least 24 hours before painting with any standard emulsion paint.

  7. I have cement coping stones atop my low garden wall, painted many times over the years with gloss, now all flaky,I’ve tried sanding, and wire brushing to no avail, if I remove with paint stripper, it may kill my plants beneath if rinsed off. I would greatly value your wisdom and expertise.

    • There are a few ‘non-toxic’ paint strippers that should be safe to use around plants – Biostrip is one such brand although there are quite a few alternatives.

      Paint strippers in general are unpredictable as far as results go though. Sometimes they work a treat and at other times they prove to be a waste of money. Trial and error with a few different brands often proves to be the most effective solution although it’s not a cheap option, especially for a one-off job!

      A blow torch or heat gun may also help but, again, results are unpredictable. If you have one to hand by all means give it a try but I wouldn’t recommend buying one just for this job as the odds of success are pretty slim.

      However, since you suggest the remaining paint is proving hard to remove I wonder why you just don’t paint over it? If you don’t want a gloss finish you could just use ordinary masonry paint – it should adhere OK provided the surface has been sufficiently abraded?

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