Sir/Madam I would be grateful if you could recommend a waterproofing roof paint. It needs to be applied to an already covered curved roof. It is for a Victorian railway coach which has a well bedded canvas roof and several layers of oil based gloss paint. this is now deteriorating, peeling and cracking. I like the idea of a rubberised paint which would take the movement of the coach. It needs to be able to withstand occasional hot cinders from the steam locomotive, It needs to be white. It needs to be applied by brush. The covering area is appx 30 sqm