Go to your local "China made tool dealer" and buy a gravity fed HVLP with at least a 1.8mm tip and you will do fine. The dump gun would be okay if you were spraying in the mold, but it puts out WAAAAY too much material for a re-gel or repair situation. I commonly use a little gravity fed gun that has a swivel cup on it with a 2.0 tip. I buy them from a local tool wholesaler for about $40. For larger jobs, I have an HVLP pressure pot with a 2.0 that I bought at Harbor Freight Tools for about $120