I have just bought a walnut thumbhole stock for my AA S410 off the forum from Lampy

I would like to show it some love before I swap it for the beech one my rifle is currently wearing
It's an Air Arms stock, will I be able to just apply some CCL oil or will it have a sealing coat on it that will have to be removed first. I'm happy to have a go at adding the CCL oil but I feel that removing a sealing product is beyond my skill levels!
Does anyone know what Air Arms finish their stocks with?
Thanks,
Paul