Primer is not needed. I shot the bottom of my 78 vking with gel. I mixed regular white gel with wax additive, catalyst, duraclear for shine, and thinned the mix down with medium temperature lacquer thinner. I prepped the hull buy sanding the old gel down with 80grit. Then shot 3 or 4 heavy coats. After a few days of drying i wet sanded the hull with 400, then 600, then polished it using 3M's fiberglass polish.

I heard primer will bleed through even when it dry. I would go right over the old gel. Paint can even go over jel and turn out great... just ask king gill.......... his boat is sweet. Paint over gel.

Well, I sprayed the bottom of my Viper with white Gel and Duratec in a 2.0mm HVLP gun. It came out great! no primer. I did have to wet sand and buff, but I was very happy with the application. I have never used a spray gun before. Next is the top half. I'll keep you posted!

Spraying gel is not all that simple. Gel, by itself, will not completely harden, even with a catylist. Also, gel is not self leveling. It will need to be wet sanded and buffed to look good.

Im with you two. I would like to know this also for when I do the bottom of my boat.

I was goina ask the same thing! Looking forward to the replys

Ok, after reading other post, I have also decided I will gel my viper instead of painting it. I will be adding the Duratec addative to the gel. My question is, do I have to prime the boat first just like I was using paint or can I gel over the old sanded gel coat.
Thanks