Like Edgar, I have experienced clouding on unvarnished interior surfaces. When I used LBI resin (a small company in Groton, CT) I had some clouding problems with their fast catalyst.

The varnish is worth it even without the clouding issue. Varnish gets a better shine.

> Starting this spring I have been building some Greenland paddles.
> After I coat them with epoxy, I use the remaining epoxy and coat my
> garden tool handles. They have been baking in the summer sun every
> day and there's no clouding.

> I have never seen this clouding that I hear about and worry about
> when I try out a new un-varnished boat. Has anyone experienced this?
> I've been using Raka epoxy (this time). Maby this whole clouding issue
> is a big myth. I have never experienced it. I use epoxy alone on the
> Greenland paddles and the epoxy never clouds and some of them are
> three years old.