Re: alternative to epoxy for fairing?
+1 on try, try again. You'll get it. I might add that part of the art of this lies in the mix of fillers; another part lies in the cure rate. In my experience, epoxy mixtures get thinnner a few minutes intp cure, than start to tighten up. So there is a "sweet spot" in both mix AND when to start filetng after mixing. ( and when to quit if the batch your using gets too stiff/too far into cure.
My Two Cents
There are two kinds of boaters: those who have run aground, and those who lie about it.