getting ready for paint
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getting ready for paint - 8/11/2007 8:32:44 AM
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410600f2
Posts: 317
Joined: 4/27/2007
From: Easton MD
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took my plastics off last night and was wondering how much I need to sand. Do I need to go down to bare plastic or just enough to knock the shine off?
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RE: getting ready for paint - 8/11/2007 9:09:23 AM
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madgreek
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That depends on how well the existing paint sticks and how many layers there are. Also, make sure it wasn't can painted previously (enamel). If so, you have to get rid of all of that (unless you're can painting again). Make sure you feather out any chips/deep scratches. I'd recommend starting with 220 grit and moving on to 400 after a couple good primer coats (more if it's needed to fill very small imperfections) The best way to go is all the way down to the plastic, but it's very time consuming, unless you know somebody who can media blast plastic (check around, this could save you alot of hassle). If you can get all of the paint off, make sure you 400 grit the bare plastic and use an adhesion promoter (bulldog is best) right before (and I mean right before you paint). What kind of paint are you planning on using? Some say that a single stage urethane is best for flexibility, but a base/clear urethane will work perfectly.
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RE: getting ready for paint - 8/11/2007 9:46:32 AM
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410600f2
Posts: 317
Joined: 4/27/2007
From: Easton MD
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Yup, its a urethane. I told the guy at NAPA I wanted something easy and that is what he gave me. The plastics have factory paint on them so I was thinking all I would have to do is sand it to a dull surface without going to bare plastic. Bare plastic vs. dull surface ... I have been told either will work fine , but I am counting on the dull surface to work because all I have laying around is 800 grit and its a b$tch getting down to bare plastic and all the shops are closed now so I cant get any paper.btw paint is a graphite metalic pearl from the lexus/toyota line.
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RE: getting ready for paint - 8/11/2007 9:58:42 AM
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madgreek
Posts: 714
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800 should work, it'll just take a little longer. A regular 3m scotch brite pad seems to work great for me, if all I need to do is knock the shine off. Good luck man, sounds like a sweet color.
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RE: getting ready for paint - 8/11/2007 10:17:22 AM
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410600f2
Posts: 317
Joined: 4/27/2007
From: Easton MD
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thanks, I'll post pictures when I'm done 
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RE: getting ready for paint - 8/11/2007 10:41:48 AM
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madgreek
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You're gonna put down a urethane primer first, right?
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RE: getting ready for paint - 8/11/2007 10:46:21 AM
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410600f2
Posts: 317
Joined: 4/27/2007
From: Easton MD
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The guy told me I would be fine with just sanded plastics. If I'm only dulling the surface do I need to prime?
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RE: getting ready for paint - 8/11/2007 10:56:42 AM
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madgreek
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You really should... and the more I think of it, the more I would really like you to get some 400 grit. I'm not sure that 800 will give a rough enough surface for the paint to hold on to. By all means, get a second opinion from a pro. I just do this in my spare time.
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RE: getting ready for paint - 8/11/2007 11:02:07 AM
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madgreek
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Problem is, they are a few different schools of thought about bodywork and painting, so don't be surprised if you hear a diferent answer from everybody. They best way to learn this stuff is from experience.
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RE: getting ready for paint - 8/11/2007 11:04:56 AM
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madgreek
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I know a guy who painted his truck on top of a sanding with 180 grit! It turned out great!! He is just a magician with the paint gun, i guess...
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RE: getting ready for paint - 8/11/2007 11:15:54 AM
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410600f2
Posts: 317
Joined: 4/27/2007
From: Easton MD
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I want this to look good so any input from you and others is appreciated. What you are saying about primer/paper sounds good to me. I'm sure you have heard this before... Opinions are like ass holes ,everybody has one. I'm gonna stick with the primer/400g advice. If it doesnt work out I have another color I would rather use anyway. Its only my time and a little $.
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RE: getting ready for paint - 8/11/2007 11:53:20 AM
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madgreek
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Oh, and be sure to pick up a decent mask. That is...unless you want to be coughing up graphite metallic pearl for a few days. And right before you paint, wipe it down with some "prep-sol" on some paper towels (I use the blue "shop towel" ones from Walmart (cheap) and then with just a tack cloth. If you start to get fish eyes (look this term up if you don't understand), dry it quickly with the gun's trigger partially depressed (enough for just air, not paint to come out), then keep misting paint on the spot and repeating until the fish eyes go away. Hopefully you have someplace well ventilated (if not, crack a few doors/windows if the air outside is calm). Any dust that is picked will come out with a wet sand with 2,000 grit in a week or so, then buff. Other than that, I think you're set.
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