How to cover bitumen paint?

[Millerman]

Hi,

We have a concrete garage that’s been covered/waterproofed with paint on Bitumen. It’s fine, but being black the garage does feel a bit like tomb. 
I was wanting advice on the simplest way to cover it in something brighter. The main issue would seem to be adhesion to the Bitumen. Resene do have a special primer which then allows Bitumen to be painted, but I was wondering if there were other options. Not worrying about any fancy, would be happy with a simple mortar product but I suspect that would stick to the Bitumen. 

[Cedes]

I asked Google about the same thing and it said to use a shellac based overcoat. I'm going to try that myself as I waterproofed joints on a roof and apparently bitumen needs to be sealed to protect it from breaking down in UV rays. I'm going to use that one mentioned above which the manufacturer says they don't know if it'll go over bitumen. I'm betting it will and will risk it. 😁

[EricL]

Hello @Cedes 

Thank you for sharing your proposed plan. Please keep us updated with your progress, it would be interesting to find out how the overcoat will work on the bitumen surface and if it will manage to resist the bleed through of the bitumen colour.

Eric