Posted by Stephen Newell on November 20, 2012 at 06:07:11 from (220.127.116.11):
In Reply to: Re: order posted by non paint'n fool on November 19, 2012 at 16:34:22:
A lot of primers will let metal rust underneath the primer especially if there is a nick through the paint to the metal. The rust will creep out laterally from the nick under the paint. With an epoxy primer it seals the metal so there won't be any rust under it. In the event of a nick in the metal the rust will stay isolated to the nick and not creep out laterally. This is the reason the epoxy primer is put on first. I even wait until the primer is on before I use any bondo to fill imperfections. Epoxy primer is a tough coating but doesn't sand well. This is really where the filler primer is needed. It's difficult to bondo a spot and sand it completely level so it doesn't show though the paint. You may have a spot that isn't quite sanded level enough and when you spray the filler primer it will show up. Some people use two different colors of surfacing primer and alternate the color with each coat. This lets you know where the high and low spots are when sanding. CNKS is correct about the exhaust fans. I would only use window fans with water based finishes. I think your idea about the spray booth won't help you except for the lights. Blowing air into the spray booth is more likely to blow dust up into the paint. It would be best if you had a explosion proof spray booth fan pulling the air out, but that's very expensive. The Omni line of paint dries pretty fast so dust shouldn't be too much an issue. I would just clean the shop real good blowing the dust off the walls and floor with a air hose or leaf blower the day before you paint. Just remember when you paint most of the dust that you get into the paint comes off you. You end up getting dust all over yourself sanding and then when you start spraying the dust falls into the paint so make sure the painter is clean too. As far as the climate controlled shop, you need to turn it all off and if you have older gas heat with a pilot light, turn it off also. Even electric heat has a electric motor that can ignite the paint.
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