I've primed some new wood with Dulux aluminium wood primer which is solvent based. Probably overkill, but I wanted a very good seal. I plan to finish with two coats of Dulux eggshell, which is also solvent based.
My question is firstly whether I need an undercoat at all, and secondly whether this also needs to be solvent based.
I have some Dulux water based undercoat which needs using up. Can I use this between two solvent based layers?