Rear bumperette-filler material
10-23-2011, 02:17 PM
#1
Rennlist Member
Thread Starter
Rear bumperette-filler material
There is some bubbling (sorry-no pic) under the paint where the rear bumperettes were deleted and filled in. 94 is now back at the body shop for the 3rd time to try & remedy this situation. Pretty sure the materials previously used were the 3M products below. I know Carl & Sean have done this to their cars, and did not seem to have the problems that I am having. If someone can chime in on what to flexible filler plate to fill the hole, and joint compound was used in their successful application would be greatly appreciated. Another option is to buy Jerry Feather's rear bumper that already has the plate section narrowed for US specs that came out great. https://rennlist.com/forums/928-foru...te-how-to.html TIA. 77Tony
10-23-2011, 02:53 PM
#3
Drifting
There is some bubbling (sorry-no pic) under the paint where the rear bumperettes were deleted and filled in. 94 is now back at the body shop for the 3rd time to try & remedy this situation. Pretty sure the materials previously used were the 3M products below. I know Carl & Sean have done this to their cars, and did not seem to have the problems that I am having. If someone can chime in on what to flexible filler plate to fill the hole, and joint compound was used in their successful application would be greatly appreciated. Another option is to buy Jerry Feather's rear bumper that already has the plate section narrowed for US specs that came out great. https://rennlist.com/forums/928-foru...te-how-to.html TIA. 77Tony
Sorry to hear...if the paint is bubbling and NOT cracking then it sounds like an adhesion problem and not shrinkage. Are the bubbles at the edges of the patch??? All over the patched area? The material might not of dried enough before sealer / primer...that would cause bubbles.
10-23-2011, 04:20 PM
#4
Rennlist Member
Ouch Tony, sorry to hear about that!
I second Dean's suggestion, most likely it was primed/painted before filler had time to outgas enough. That would cause the bubbles. If it was cracking, it would indicate too thick a layer of filler, or shrinkage. Could also be bleed through caused by insufficient thickness of primer. HoK recommends 2 mils over filler to prevent bleed through, I am sure your paint system requires the same.
Cheers from Liege!
Carl
I second Dean's suggestion, most likely it was primed/painted before filler had time to outgas enough. That would cause the bubbles. If it was cracking, it would indicate too thick a layer of filler, or shrinkage. Could also be bleed through caused by insufficient thickness of primer. HoK recommends 2 mils over filler to prevent bleed through, I am sure your paint system requires the same.
Cheers from Liege!
Carl
10-23-2011, 05:13 PM
#5
Rennlist Member
Thread Starter
Dean, The bubbles are in the center of the patch. I'll check with the body shop and see how thick they laid the primer. How long is enought time for outgassing? TIA. 77Tony
10-23-2011, 06:39 PM
#6
Drifting
The "center" would be the last place to release drying gases I would think. I would say it should be on the product packaging and I'm sure it has a lot to do with humidity and temperature.
BTW...I used the same stuff on Garrett's bumpers but it was near 100 degrees out side at the time and after sanding I still let it dry for another 12 to 18 hours.
BTW...I used the same stuff on Garrett's bumpers but it was near 100 degrees out side at the time and after sanding I still let it dry for another 12 to 18 hours.
10-24-2011, 06:11 AM
#7
Drifting
Those fillers are meant for use in production body shops and don't require time to outgas. It can be painted over as soon as you finish sanding or very shortly afterward (1 hour or so.) The only way to determine what failed is break open a few of the bubbles to see the layer where they formed. Did they only happen in the areas that were patched?
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10-24-2011, 11:30 AM
#8
Drifting
Yep...sorry....the data sheet says NOTHING about having to wait more than 30 minutes and that is to sand. So.....out gases are not the problem.
JHowell37 helped me a ton while painting my son's car. I would trust his judgment in a case like this. I am still learning.
JHowell37 helped me a ton while painting my son's car. I would trust his judgment in a case like this. I am still learning.
