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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-25-2004, 01:02 PM   #1 (permalink)
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ok, been workin on my drivers door, to repaint it at home on the weekends in my dads garage. Worked out some surface rust on the bottom corner and sanded the whole door down and applied some Dupont Primer/Sealer. Not high build surfacer.. so got it painted last night, this morning I wet sanded it 600 grit, got any bits of orange peel out and let it dry out for a nice hour and half with a 500watt light hitting it. So I got the paint, reduced it 1-1, I'm using PPG paint and reducer might I add, and 1st tack coat goes on, lookin normal, i wait about 5 minutes, put on the 2nd coat, a normal coat, wait about a minute and all of sudden the paint starts spider webbing everywhere on the door like crazy. OK, I painted the door molding peices as well, they are the only peices that turned out good. Look at the door, if anyone has any ideas as to what might have happened, let me know, it would help a lot.


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Repainting My Driver Side Door, Check Out The Pics-dcp_2162.jpg  
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Old 11-25-2004, 01:17 PM   #2 (permalink)
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it oxidized it looks like.. I had this problem with my spoiler. wet sand it with 400grit and get it all nice and smoothe again and then reapply another coat. make sure the temp is at least 80 where you're painting. any colder and it'll do that.
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Old 11-25-2004, 01:23 PM   #3 (permalink)
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also forgot to add... if you DONT get that thing perfectly smoothe before you reapply the paint, it'll do the same thing again in the areas that still have that spider web affect. you'll probably spend 2-3 hours wet sanding it
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Old 11-25-2004, 01:27 PM   #4 (permalink)
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I am pretty sure it has to do with the Sealer I used for the job. when I applied the sealer, I wet sanded it down this morning, which it is not a sandable primer, just supposed to be applied, and then painted right over it. I am pretty sure since I sanded the sealer and used wax and grease remover on it that it caused the paint to do that. I'm gonna wait a while for the paint to dry, and then take the DA sander with 220 to it to remove all the paint, then reapply a new coat of sealer, let it dry 45minutes, not sand it, and paint directly over it like I should have in the 1st place. It's a pain in the ass
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Old 11-25-2004, 02:09 PM   #5 (permalink)
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Quote:
Originally posted by bimmerfan620@Nov 25 2004, 08:27 PM
I am pretty sure it has to do with the Sealer I used for the job. when I applied the sealer, I wet sanded it down this morning, which it is not a sandable primer, just supposed to be applied, and then painted right over it. I am pretty sure since I sanded the sealer and used wax and grease remover on it that it caused the paint to do that. I'm gonna wait a while for the paint to dry, and then take the DA sander with 220 to it to remove all the paint, then reapply a new coat of sealer, let it dry 45minutes, not sand it, and paint directly over it like I should have in the 1st place. It's a pain in the ass
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Sounds like it will either be atmospheric or sealer related. I've come across them on separate conditions. You're unlucky to get both. Try and keep the temp constant throughout to try and smooth things along.

A friend of mine tried to clean his undercoat with petrol and it turned his paint to rubber almost, he wasn't too happy.

Good luck. Keep us updated!
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Old 11-25-2004, 03:34 PM   #6 (permalink)
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well, went outside to the garage around 2:30, just came inside, 4:30, from some nonstop DA sanding, went through about 10 peices of 220 sandpaper (gums up fast). the door is almost cleaned down to the stock paint and 1st coat of sealer.. I was looking on the quart of Dupont Sealer I bought, it specifically says, wait at least 10 minutes to dry before applying top coats, and if you let it dry overnight, you need to scuff it, clean it, and reapply another coat of sealer before painting. I guess i did wrong by wet sanding it and painting directly over it. Sounds like a chemical reaction caused by the sealer being sanded. hmm... after dinner I'll shoot back outside clean it up, spray the sealer, mix up some paint and give it another go.. temp is about 74 degrees right now and humidity is quite low... i'll make sure to take some pics.
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Old 11-25-2004, 05:33 PM   #7 (permalink)
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ok, got the pics of the door almost sanded down all the way. almost all of the new paint is off, still have the lower section of the door and various other parts.. Becoming a pain in the ass completely... it's 6:31pm now. I'm hoping to get the new sealer on by 8. will post pics as soon as things are rollin again.

aaron
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Old 11-25-2004, 09:03 PM   #8 (permalink)
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door's painted... finally everything worked out the way it should have 8 hours ago. it's now 10:00pm and I just got cleaned up from being outside in the garage. I come to find that it was an earlier mistake of me sanding the sealer when your not supposed to. Paint went on pretty tight, except for the few heavy scratch marks i can see from me taking down the junk paint from earlier and a few runs plus your typical orange peel. Oh well, i'll wait for it to dry, and try to sand it down, take out the runs and put on another coat. and maybe then, i can finish this pain in the ass project.
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Old 11-26-2004, 12:15 AM   #9 (permalink)
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so any pics of the door now finished?

David
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Old 11-26-2004, 12:16 PM   #10 (permalink)
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i'll take pics in a while. I had the oven on to bake it for an hour last night, can only get the temp up to 102 in the garage, the oven won't go any hotter. So i'm hoping the paint is dry enough to work with. Gotta get the runs out of the door, and I'm going to fill the few scratches before i wet sand and put my last coat down. It's 1:15 EST now, should look at getting some pics around 4.

Aaron
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Old 11-27-2004, 01:43 PM   #11 (permalink)
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ok, finished product. Well, everything except for rubbing it out. Turned out pretty nice, a little orange peel in spots(problem adjusting gun) but nothing some polishing compound won't take down. car's still sittin in the garage, I cranked the heat on to bake it. Here's a pic, i'll get some better ones of the car outside with the masking off later.

Aaron
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Old 11-27-2004, 09:28 PM   #12 (permalink)
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it's almost impossible not to get some orange peel - looks like you did a good job.

Most likely I think the chemical reaction you had was from residue from the wax/grease remover - you have to make sure that you use a cleaning solvent that will not react with the paint and will dry without residue. I very much doubt that you had an atmospheric reaction because the conditions you're painting in sound ideal. You can actually spray at 50 degrees - you'll just waste paint because it doesn't adhere as well at that temperature.

Also, you can't just use any primer with any paint - there's always a chance of paint reaction between the primer and paint if you're not careful. Sounds like you used some great quality paint though - I'm almost looking forward to the point where my paint gets really oxidized so I can put a coat of calypso red on it.
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Old 11-27-2004, 10:10 PM   #13 (permalink)
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lol, shoulda just left the paint like that heh, then done the whole care that way.
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