This is a good one for the professional Painter/Decorator, or even if you are a DIYer interested in getting a good finish. Owatrol oil is a unique paint additive that helps to improve the finish and eases application, and is particularly good in difficult conditions. When it is added to any oil based paint (eggshell, satin or gloss), varnish or stain it will help to beat paint drag, thus reducing brush marks. I can vouch for this myself, having used it for some years now. Unlike thinners, which can weaken the paint, Owatrol fortifies it-increasing penetration and adhesion to provide a longer lasting finish that will resist flaking and peeling.

This can be obtained from any good Decorators merchant.