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Old 07-21-2010, 06:17 PM   #11
Join Date: Aug 2009
Posts: 187
Year: 1963
Coachwork: Grumman
Chassis: Chevrolet
Engine: Chevy 292 I-6
Re: Paint prep

What the final abrasive level before painting is depends on what you plan to paint it with, the manner of application, the temperatures you expect to paint in and your sensitivity to visible defects in the finish.

Yeah, I paint, daily.
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Old 07-21-2010, 06:30 PM   #12
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Location: Montana
Posts: 1,615
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
Engine: 8.3 Cummins
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Re: Paint prep

Probably a roller. Sure it will be 80's with 14% humidity. I dont want it to look nasty, b ut it doesnt have to be perfect either. I figure I would surely thin the paint down some.
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Old 07-21-2010, 08:10 PM   #13
Join Date: Aug 2009
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Year: 1963
Coachwork: Grumman
Chassis: Chevrolet
Engine: Chevy 292 I-6
Re: Paint prep

Me, I'd use a 220 grit on a DA, and follow it up with 400 grit by hand, sticking to horizontal strokes. But, I have more sensitivity to surface defects.

Hint: a DA or palm sander will leave curly-q's or swirls. They will be visible from every angle. hand sanding with a lighter grade horizontally will minimize the viewing angle of sanding scratches.

Pick a panel to test on, paying close attention to your paint/reducer ratio. When you it the magic ratio for the temps and humidity, one that allows the paint to flow out without runs...
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Old 07-22-2010, 12:54 PM   #14
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Join Date: Mar 2009
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Year: 1992
Coachwork: Thomas
Chassis: Ford B700
Engine: 5.9L Cummins
Rated Cap: 65
Re: Paint prep

I always scuff the paint with an air palm sander using 320 on the flat areas and hand sand the rails and areas with 320 that it cant get into. I use 220 over any rough spots, painted lettering etc and followup with 320. If youre rolling it on you can probably use 180 or 220 but you can see the scratches if the paint is applied thin. Blow it all off with air then wipe it down with wax/grease remover. Id find an auto paint supply place local or online and get 1 roll of 3M PSA (sticky back) 6" round 320 and a smaller pack of 220 and 1 gallon of silicon/wax remover. Having enough sandpaper and changing it often will keep the job moving quickly. Ive had bad luck with other brands of sandpaper clumping so dont cheap out with this, its relatively inexpensive considering all of the time put into painting.
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Old 07-22-2010, 04:10 PM   #15
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Location: near flint michigan
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Re: Paint prep

one more thing....

i find that washing the bus with water is very very bad before you paint. water gets trapped under the rub rails. The water runs out when spraying the paint and makes a really big mess.
Quis custodiet ipsos custodes (who will watch the watchmen?)
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