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!