I forget the company but somebody makes an actual catilized spray clear out of can. You can only find it at autobody supply stores (not like autozone). It is somewhat pricey as well. I think this would do the trick as it actually has hardener in it (it is like 2 part expoxy). I would be it is overkill but if you are really struggling, might be worth a shot. I think any clear enamal will hold up well, especially automotive stuff in a can (though it doesn't compare to automotive paint out of a gun).