releasing rough mould?

hi i read somewhere on here for rough moulds you can just use pva as release and 80 grit finish is fine…

can someone just confirm this?

obviously a few coats of PVA?

i will be making quite a few different hood/bonnet moulds soon and im gunna make a rough mould for the ribbing to save time in the future.

cheers
ben

PVA is your friend, multiple coats, and release with water.

thankyou:)