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83 911 Production Cab #10
 
JJ 911SC's Avatar
 
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
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Question Bumper Painting

How do I prep them? and if I remember well, the DuPont is the one to use.

Thanks

JJ


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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 07-08-2011, 04:38 AM
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i cleaned mine very very well with dish soap, and used black shoe polish
Old 07-08-2011, 07:35 AM
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dkbautosports.com
 
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i'm not a big fan of painting thing that are not painted from the factory . on parts like that i do the vaseline trick to them . if you feal you must paint them then this is the way to do it . 1st you have to remove years of dressing from the parts . like a sponge rubber parts soak up the silicones from the dressings that are used . put the parts out in the hot sun for 2 or 3 hours . with the part still hot use very hot soapy water and wash the part good also rinse with very hot water . dish soap does work good for this type of cleaning . but DO NOT use a dish soap or any other soap with things like lanolin in it !!!!! return the part back out in the hot sun and then get the next part and do the same cleaning to it . after all parts are washed , dry and still hot from the sun use a pre paint rubber / plastic cleaner on them . a product like RM's 902 plastic cleaner works good for this . wipe the part down always use clean rags and change them as soon as they get dirty . when the rags are no longer dirty from wiping the part down then go on and do the next part and repeat the wipe down like you did on the 1st part again untill all the rags are clean from the wipe down . now its time to prep the parts for paint . there should be no need for the parts to be hot any longer . you want the parts now at room temp. with a product like presta's scuff stuff part # 131732 and a gray scotch brite pad ONLY scuff the parts real good . you could use some 400 or 500 wet paper but the scuff stuff works much better . wash the parts again with worm water let them dry then clean once more with 902 the same way as the 1st time . use a tack rag and tack off the parts . do not touch the parts with your bare hands after you clean them . after tacking spray one light coat at 1st then after it flashes off spray another wet coat of SEM's 77723 plastic adhesion promoter . let the adhesion promoter flash 15 minutes or so . then spray the trim black color to the parts . again start with a light coat or two then on the next two coats spray medium wet coats . trim black colors come out best when you don't spray them in to wet of a coat .

Last edited by 962porsche; 07-08-2011 at 03:11 PM..
Old 07-08-2011, 03:00 PM
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83 911 Production Cab #10
 
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Thanks. Seem a bit complex for a non painter with little patience

What is the Vaseline trick?
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 07-08-2011, 03:11 PM
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its not complex you just have to clean them real good of the finish you spray on will peal . why do you want to refinish the parts ?? is it because there old and faded and starting to look get the white look to them ??
Old 07-08-2011, 04:55 PM
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83 911 Production Cab #10
 
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They are not in bad shape.

From seeing old photos, one of the PO had an... Italian flag on one of them.

When I got the car, only the glued shape was left on it (shinny rectangular on the pics below).

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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 07-08-2011, 05:20 PM
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did you try to wipe the spot were the sticker was with lacquer thinner ?
Old 07-08-2011, 05:57 PM
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No but since you mentioned it (don't want to say recommend in case some thing goes wrong), tomorrow I'll do a small spot using a Q-tip and see what happened.

Thanks

JJ
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 07-08-2011, 06:29 PM
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how bad do want it gone ??try some pre paint cleaner 1st but that only works for remove the stickness left from the sticker . if you use thinner i will tell you what will happen . if you let the thinner sit it will start to melt the plastic . you have to wipe it on and having a rag in the other hand you will have to wipe it right back off . will it harm the plastic for ever no . a q-tip will show you nothing . the thinner will suck the oils and silicones right out of the rubber and leave what you wiped dull . if the spot does wipe off with thinner you then can do the vaseline treatment and that should bring it back to life . the thing is some times when people put a sticker on some part of a car . there is a permanent mark from it that is a PITA to remove . at times they will even show back up if not repaired correctly . the thing is that if a sticker is left on a part of a car like rubber the reguler wear and tear that goes on does not happen under the sticker . so at times you may just paint it and you will still see a ghost if were the sticker was . if that happends then there is more work to do to get rid of the mark . if you can remove the mark by wiping it with a solvent and it removes the shine from the rubber you can get the shine back most of the time with vaseline jelly . with a clean rag ! if you spread a good coating if VPJ over the area when the part is cool then put it in the hot sun for two or three hours and let the VPJ soak in .( if its real dryed out rubber you will see it soak in faster ) . then bring the part back inside let it cool and using an other clean rag wipe off the extra VPJ . you may have to repeat the vasiline 2 or 3 times if its real dull . but it is one way to bring damaged rubber back to life . the thing with the rubber parts alot of the time is theres just alittle texture to the part . so just putting some primer over the area and sanding it were the sticker was . is that spot will be to flat and smooth because it will fill the texture in the rubber .
Old 07-08-2011, 07:26 PM
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I just used the SEM products for plastic, its a flex satin black but you have to use their prep with it, seems to work great, the prep kind of softens the plastic for a good bond but does not change the texture. Here are some side moldings I just did that were pretty chalky.


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Old 07-08-2011, 07:33 PM
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