While fixing up the workshop, I've painted the bottom 18" of the back internal wall with Aquaseal black bitumen paint in an effort to prevent damp coming through (the construction is slightly complicated to explain - the bottom of it is a concrete pad which is next door's [somewhat higher] ground level, so it's a bit susceptible to damp).Anyways, next up will be to paint the rest of the walls and floor, and I'd quite like to overpaint the bitumen area at the same time, just for cosmetic reasons. I emailed the mfr for recommendations on what to use, and was advised: "our bitumen paint range cannot be over painted with any paints that I am aware of as they bleed oils when heated up. The only way to find out would be by contacting a paint manufacturer as they may have something that we at Everbuild are unaware of".So, any suggestions?! Do we reckon stain-block paint would do the trick, or is bitumen paint too much for it to handle? I don't want to waste my time overpainting it if it's going to bleed through anyway; it would look worse than just leaving it... it's only a workshop after all!ThanksDavid

I've not found anything to stop bleeding when overpainting.In my workshop I have hung polythene sheet*, polystyrene insulation & timber battens and then clad in plywood. I then painted the plywoodThat works!Bob*bitumen attacks polystyrene as well.

Overpainting black bitumen paint?

Jul 05, 2011 Last reply: 7 years ago 24 Replies

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The Natural Philosopher 7 years ago

I tend to agree.

Probably best to line it with lining paper. Test that paste holds to it

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Chris Green 7 years ago

Our solution of many years ago was a coat of alumninium paint over the black bitumen.

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tabbypurr 7 years ago

I once used bitumen paint to line a mould, thinking the stuff wouldn't stick to it. But it very much did. It was a cement mix.

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tyronebuchanan 7 years ago

Ty,

A lot of the comments are irrelevant. There are two types of bitumen paint: oil based and water based. Oil based bitumen paint is difficult to get today.

Make it clear in you comments what type you are talking about. They are two entirely different paints.

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tabbypurr 7 years ago

Most of mine is paraffin & bitumen. You can always make that if you buy bitumen. I'm told you can get 25l drums of bit from builder's suppliers (not diy sheds).

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