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At the weekend I decided to paint our living room ceiling. The house is about 50 years old and it is boarded wood. I bought some decent quality wall and ceiling paint, wiped it down and got on with it.
I was expecting it to take 2 or 3 coats and after the 2nd coat I can see that there is some colour leeching from the wood and making the paint turn yellow. I asked at the paint shop yesterday and was told that it was too late to do anything about it now, I should just let it dry for 48 hours between coats and hope that it covers.
Any pearls of wisdom or great ideas for covering up the stains? I was considering an undercoat you'd usually use for gloss paint and then some matt finish paint if I can find it in Denmark, but I am worried that as everything is water based these days, the colour will just leech through anyway.
is it discolouring where the knots in the wood are? If it is then try rubbing it back and put knotting compound over the affected areas.
undercoat is quite good for blocking out darker colours so you can paint over the top.
You can buy specific 'stain block' paint though that stops leeching. Has worked for me in the past.
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Used dulux stain block (2x coats) in the past & Then emulsioned over the top
No problem with knots as it was (apparently) a fancy sort of wood used and there are no knots.
The paint shop person told me that it was too late to use a stain block undercoat now that I had used emulsion on it once.
Sounded like BS to me, but I was ready to spend some money on paint and left empty handed as a result of that advice so I guessed there may be something to it...
Second coat done last night and the wood is covered, but there is plenty of colour coming through
I'd recommed you have a look at a stain blocker. You should be able to get Dulux or International paint in Denmark. They are international brands.
Have a look on the tin to see what surfaces you can paint. The only reason you might not be able to use them is if they are required to penetrate the wood but that seems unlikely. IIRC they work by forming a physical barrier rather than any kind of chemical reaction.
I work for the parent company, but these views are my own. I have used the international products in my house but I get them cheap. My decorator recommended Johnstone's but it worked out cheaper to supply my own.
Won't a coat of PVA sort it out?
you can put stain block over other paint as long as it is dry. That is how you cover up marks from leaks above. Just repaint over it.
A stain blocking primer would have been best though as it would have let you use less paint.
I have had a quick look online and I can get stain covering paint, I just don't really undestand why I was told that it was too late.
I guess the options are
1: They don't sell stain covering paint in that shop
2: My Danish isn't as good as I thought and I just confused the shop keeper
3: She was wrong
I think I'll buy some and see what happens although it all costs a fortune here, looks like about £70 for 5 litres of the right stuff 😯
on top of the £45 I spent on the 10 litres of white emulsion...
I bet she thought you were painting bare wood and was trying to sell you a specific wood primer. My very limited experience of these is that they do need to penetrate to work properly (e.g. knotting solution).