I'm planning on painting a window moulding which is in bare wood. Was going to use the Dulux Trade weathershield 3 part system, however I've seen that Ronseal do a 7 yr guarantee on their products where you can use a primer/undercoat then a gloss saving the additional cose of a seperate primer and undercoat. Has anyone used the Ronseal products? If so, are they as good as Dulux, as they are offering a 7 yr guarantee against flaking etc.