Q: Can you paint Bitumen Paint onto exterior plywood as a temporary waterproofing measure before the roof is felted? A Q: Can you paint Bitumen Paint onto exterior plywood as a temporary waterproofing measure before the roof is felted? A: No, this will not offer any protection as the paint will soak straight into the wood, it is best to simply felt the roof Cromar2020-03-18T16:47:39+00:00 Share This Product. FacebookXWhatsAppEmail