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Author
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Topic: paint/clearcoat prep question
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sigtauenus
Gearhead Posts: 2180
From: Far East, currently in Japan
Registered: Jun 2000
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posted 05-31-2001 11:33 PM
   
alright guys, the passenger quarter on my fastback is cracking out and I've decided that any temporary fix I do will look better than what it looks like now. As I've mentioned before, I have a savings account with a monthly allotment out of my pay so that in a couple years I can just take the car in to a pro and have the money to say give it back when it has a show quality finish. Anyhow, my plan is to grind down the cracking filler, refill it and paint to match. (the quarter panel will eventually get changed, but not right now) I would like to use clear coat on top of the repair and the surrounding area to blend it, but don't know if that's a good idea or not. If I do go for some clearcoat, what grit sandpaper do I use to rough up the color? Seems like I remember using a lot of 400 grit before we painted the car 7 years ago, but I don't want to cut through the color. Any suggestions?
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Paul Leonard
Gearhead Posts: 108
From: NLR, AR, USA
Registered: May 2000
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posted 06-01-2001 09:43 AM
Most of the body shops I know around here use a 1000 to rough up the paint prior to a clear coat application. 1000 wet sanded. It doesn't feel much rougher that a piece of construction paper. Good luck. Paul
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sigtauenus
Gearhead Posts: 2180
From: Far East, currently in Japan
Registered: Jun 2000
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posted 06-01-2001 10:26 AM
Wow, 1000, so then what do you use to wetsand the car if all you are going to do is buff it out? 1500, 2000 grit?
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steve'66
Gearhead Posts: 8754
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-01-2001 11:05 AM
quote:
Originally posted by sigtauenus:
Wow, 1000, so then what do you use to wetsand the car if all you are going to do is buff it out? 1500, 2000 grit?
Sig, Yes you use 1500-2000 grit for "color sanding".
1000 sounds good for clearcoat prep sanding. Get one of those sanding pads with holes in it for color sanding. Good luck, SteveW
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mellowyellow
Gearhead Posts: 6609
From: So. Fl.
Registered: Aug 2000
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posted 06-01-2001 11:10 AM
Sig: Not totally clear about your intent:1. Is there Bondo on the 1/4 that has cracks
2. What kind of paint is on the car?
3. Are you planning to remove the paint to
redo all the Bondo, put in new filler and
finish off. Are you going to spray on new
paint on the whole 1/4. You mention the clear coating as the final finish but do not mention the color coating.Is it possible that the cracks are just in the paint. Are these cracks big. It almost seems like it would be best to wait before doing a patch. At another time you mentioned that the paint was a custom mix. Would you be able to get matching paint. I dont know, Sig, but it sure sounds like a big can of worms Is the 1/4 so bad that it needs to be replaced.
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sigtauenus
Gearhead Posts: 2180
From: Far East, currently in Japan
Registered: Jun 2000
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posted 06-01-2001 11:51 AM
1. Is there Bondo on the 1/4 that has cracks?Yes. (the other quarter was replaced several years ago due to an accident, and the paint was matched and blended with clearcoat but the work was done by a professional shop) 2. What kind of paint is on the car?
Dupont Imron (sp?) 3. Are you planning to remove the paint to
redo all the Bondo, put in new filler and
finish off. Are you going to spray on new
paint on the whole 1/4. Yes, yes, and yes Is it possible that the cracks are just in the paint? No, it is definitely the filler. Would you be able to get matching paint? Yes, I'm going to take in the outer vent panel to have the mix color matched. Is the 1/4 so bad that it needs to be replaced? Yes, it really is.  It almost seems like it would be best to wait before doing a patch. Well, at this point it is just a matter of time until chunks of my quarter panel literally fall out. (the filler is above the wheelwell as opposed to the lower rear like I've seen on other cars) I am tired of looking at an ugly quarter panel and don't want to wait until I have the cash to do the entire car. Most people don't even notice it but its something I have to see everyday and seriously anything I do will make it look better than it does now.
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 06-02-2001 02:50 AM
when you remove the filler you need to prep the metal thoroughly. start by hitting the panel with a wire brush(since you are replacing the bondo you need to give it something to grab). then lay on a coat of primer(etching primer is what you need). then build up the surface with thin coats of the bondo of choice. remember to keep the coats thin and to sand the surface between coats. once you have the surface where you want it, let the bondo set overnight. in the morning give the area a light guide coat(i like black but the i use grey primer and white paint) and sand the area, 600 grit works great. then hit the area with a primer filler to fill in the sanding scraches. sand this with 1000 grit paper and then fill any pin holes. sand and prime again. now you sand starting with 1500 then go to 2000 paper(use a guide coat on occasion to make sure the surface is not rippling). once done with the 2000 paper the paint. color sand with 2000 between coats, and again after you apply the clear coat. this will give you a very smooth finish.
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69maverick
Moderator Posts: 1416
From: Thomaston,CT.
Registered: Jan 2001
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posted 06-02-2001 08:00 AM
One small trick to wet sanding is put a small amount of dish soap in the water. It will make it slide a little easier!!
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