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- 1 Jun 2016
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hi my husband has recently has recently papered our little boys room with a thick insulating paper as he was a really cold outside wall. He's caulked the gaps then painted it with a dulux Matt paint. It cracked in places just on the caulking so he gave it another coat and its still cracked. Plus you can see the vertical line where the caulking has been done. It's seems like we need to use an oil based undercoat then repaint. If we do that do we need to paint the whole wall not just the caulked bits so it's all even. And is it just any oil based undercoat we use.