Catalyzed Primer

roachello · Post by **roachello** » Sun May 24, 2009 10:21 pm

Have you guys ever used this stuff? You have to mix it and shoot it through the gun, but it comes on thick and once it's dry, it creates quite a hard shell and sands off. It'll cover grain no problem. I've shot it on #6 polyurethane foam which is extremely porous, and after 5-6 coats and sanding, I got a solid and more sturdier surface. I'm curious on how it would affect the sound of wood since it is much thicker than high build or regular primer. I believe the best type to use is polyester. I've used acrylic, and although it dries faster and sands off with a bit of effort, I got some bubbles on the surface. Perhaps it's because I create two mixtures with unequal amounts of hardener... but it's definitely a useful primer when it comes to smoothing out a textured surface.

I believe it's used for automotive and motorcycle finishing because it creates such a protective shell of primer. The only downside is that like I mentioned, it may affect the sound because it's so thick, and it takes from 2-12 hours to completely dry before sanding.

DGNR8 · Post by **DGNR8** » Mon May 25, 2009 2:24 pm

This PLACE claims to have pre-cat NITRO in cans (for furniture repair). I have tried their regular (red) nitro. It's supposed to have a better build. The bottom line with cat anything is respiration. With nitro there is a vague fear that you will get cancer or brain damage from lax spraying habits. Cats are supposed to be no BS straight-up dangerous. Most people recommend a ventilation system and full suit. I would at least read up on it to make sure it's something you want to do, and can do it safely.

I intended to change my respirator filters every spring, but I sprayed yesterday with the old filters. One trick is whether or not you can smell the nitro. I couldn't, but I also don't know that I was getting enough oxygen either.