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Thanks Chivas 69. I though I'd start off by sanding down a bit just to give it a matt surface for the paint to grip on to. I wasn't going to try to get every bit of varnish off as I didn't think that mattered as long as all the surface was 'roughed up' a bit for the paint to adhere to.

Thanks for the order of procedure Mr Chibs. I read, on a DIY site, that shellac needs to be dewaxed with denatured alcohol before painting over with a water based paint - maybe that is incorrect! I am painting 4 chests of drawers by the way.

Thanks for your suggestion Mr Chibs. Yes I have seen clear knotting solution, I believe that I have to dewax it if I want to put a water based paint over the top. I have read that I could do that using denatured alcohol which I think is the same as methylated spirit. I've also just realised...

Thanks for your info Mr Chibs, It’s useful to know how all these undercoats work - I think the blue can is the Zinsser 123 which is water based. My problem is all the knots in the pine which is why I was considering Zinsser BIN, which contains shellac, apparently the all important ingredient...

Thanks for your suggestion Chivas 69, but the BIN is not very nice, it doesn't go on smoothly like a paint, so think I'll go with KenGMac's info and just put on a primer undercoat.

Thanks very much KenGMac, I think I will give the BIN a miss. Yes the wood is thin and I looked on the other side and the knots look dry.

I want to paint some pine furniture (4 chests of drawers). They are 50 years old and finished with a varnish. I will be sanding them down and was going to spot the knots with Zinsser BIN, sand down a little, and then use a water based primer undercoat followed by a couple of water based top...