I have read many posts on the subject of sealing new plasterboard before papering and generally it seems the best idea is to seal with an oil based sealer or undercoat. I have only found water based sealers specifically for plasterboard. This may seem like a silly question but should I be looking for a specific product or will an oil based undercoat which is designed for wood be ok. Only asking because there is no reference to using on plasterboard on the tin. Any help appreciated.