Roll on Paint and/or Render Recommendations

[Vivi88]

Finally finished my layer of sand, cement and lime - I'm ready to finally waterproof my oven!

I'm thinking of getting an acrylic based paint or coloured roll on render that is waterproofed, to add a final layer to waterproof the entire oven.

Any specific brand/products (ideally with some elasticity and waterproofing) that you guys can recommend?