ShortScale.org

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.

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.