painting over synthaproof

[caminoaustral]

I have a understairs cupboard which has the walls painted with synthaproof + I'd like to paint over with a grey oil based floor paint.

Is there a way of preparing the synthaproof/bitumen to stop it leaching through into the floor paint?

would a coat of pva do or is there anything better?

thanks
andrew

 

[Bigshaggy]

hi, never painted synthaproof but if it contains bitumen then the only thing that will stop it bleeding is aluminium primer. hope this helps

 

[caminoaustral]

you're a star - just what I was looking for/thanks+
Andrew

 

[Robbie uk]

PVA is a definate No No!! Dont know how big an area you are looking at but shellac knotting will do it , as this will seal bitumen.

 

[caminoaustral]

have an area of about 8ftx2ft to cover - would the alu paint be the best option?