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Sanding Primer?


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I got this body off eBay and it SUCKS! The guy tried to refinish it, but did a really, really bad job. Some dents were filled, some weren't, but he decided to primer it anyway. It looked good in the picture, looked ready for paint. I started sanding a little, and there is different color primer under it. I sanded to wood in some spots. Between the two colors of primer, Bondo, and wood. It looks really messed up. I got it to what I thought was good, so I primered it all one color. I found some problems, so I sanded and did it again, but I bascially sanded off all the primer. I ended up doing this 3 times, primer goes on, primer comes off.

I got it down to one a few small knicks around the horn areas. Nothing horrible enough to warrant sanding off all the primer again, but I would like to sand it a little. Should I Bondo the knicks and primer then, then worry about sanding, or should I sand it get it good now, Bondo, then do final sanding?

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What kind of body shape are you dealing with? And what do you aim to do? Solid paint with a clearcoat? You say you found some "problems" that warranted resanding and primering over again, what kinds of problems? Basically you are looking for that happy medium between your highs and lows. If you are sanding properly, ie. using a rigid block on all the flats and a foam pad on the curves then everything should be straightforward. Patch up all your holes first. Then check all your flat areas with a straightedge. If you have some serious dips then you can fill the low areas and sand down the high areas until you reach an overall "levelness". Then shoot primer over the entire surface, lightly sand and apply finish coats.

If you are constantly breaking thru the primer coats then you are:

1. using sandpaper grit that is too coarse

2. not sanding evenly over the entire surface

3. using too much force when sanding

4. not using rigid/flexible blocks on the appropriate areas

5. a combination of the above

If you are sanding with just your fingers in one area you will wind up creating grooves in your surface.

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