Problems Painting Brand New Bumper Cover

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PostPosted: Fri Feb 27, 2009 1:37 pm
Any other Tips on this plastic stuff doing as described having problems myself.

I am using 2k Primmer on mine to hide some repairs small area peeled off, Like the Bull dog never cured still sticky waited time recommended on can.
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Fri Feb 27, 2009 1:41 pm
GRRRR that would psss me off

Having simular issues myself, Wonder if its the Bulldog

Did you use a curing light? or light to try to heat it up to dry out?
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Fri Feb 27, 2009 2:59 pm
No curing light. It's 60 degrees here today so I figured it would be ok. This is not a run or a crack, its more like 2 pieces of paper that are pushed together and the edges push upward where the 2 papers meet, ...kind of like plate tectonics on a nano scale.

This car, and the bumper specifically have been seriously pissing me off for a month now.

The original bumper crazed, I thought I fixed it, and then crazed again. It was this second time of crazing that a fender also crazed, (didn't craze the first time). I stripped the fender, epoxy primered, redid the bodywork, and 2k primered. I bought an entirely new bumper (this one), preped it , Bulldogged it, and primed it, and the primer crazed. I stripped the primer/bulldog, and re-Bulldogged and primered yesterday and it came out beautiful. However, you see what happened when applying the 3 stage finish coat.

Today was my 3rd attempt at finish painting the pieces and 4th attempt on the bumper(s)

All the other pieces painted at the same time, 2 fenders and a hood, came out beautiful (tiny run in the clear on 1 fender but I can sand that out after it cures a few days).

My plan for the fender is to sand out the problem, fill in with 3M glazing putty if necessary,
and spot repair it. I'm afraid if I reshoot the whole bumper it will craze somewhere else.

Regarding the Bulldog, per PaintDevil's suggestion, I only put on a light coat and let ti flash 1/2 hour before the 2K primer yesterday.

jmd_forest



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PostPosted: Sat Feb 28, 2009 8:13 am
I think its the Bulldog doing this, I am having similar issues.
I am shooting mine today as I got the primmer to lay down finally, If they do this as yours did I will be so pissed I have had enough issues with these things.
I considered stripping them down and starting over but its so much work to turn around now, especially when I have them all blocked out and the small issues fixed I think?
Sucks when you follow instructions and it doesn't turn out doesn't it?

If they do it again both covers come off get sand blasted and redone with another different product and painted off the car! and I will bad mouth Bulldog forever!

I am going to try another product made by another company suggested by a friend on this sight I forgot who makes this other stuff but perhaps he will see this and post it up.
I wrote it down out in the shop on my Table when I was talking to him on the Phone yesterday.
Dennis B.
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.



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PostPosted: Sat Feb 28, 2009 8:40 am
It is just that one spot on the bumper that went bad everything else on the rest of the bumper and the other 3 pieces cam out quite nice.

I've got a small run in the clear on 1 fender that I plan to sand out and buff. The bumper cover is another story. I think I'll just sand out the crack, fill in with acrylic glaze, sand smooth, and try blending into the surrounding area.

Any other repair techniques that do not involve stripping the whole bumper (did that once already) would be welcome.

The primer laid down perfect on this cover after stripping off the first primer disaster and re-prepping the cover. It should have been a perfect base to apply the finish coats.

jmd_forest



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PostPosted: Sun Mar 01, 2009 10:06 am
Yikes, sorry to see that happen to your paint job. I am no expert but I am guessing maybe your between coats hasn't flash properly before apply the next coat. Temp is too cold and too many coats? Sorry, I wouldn't paint anything with a air temp is around 60 degrees. Just too cold for the chemicals to flashed/cured properly.

I wished I'd share this with you before your lastest effort but maybe you can use this tips or not in future painting plastic panels/bumpers etc..
This was what I was told from my paint instructors as to painting plastic parts. If it's hasn't been primed from the manufacturer.
From my notes:
1, Bake bumper ( or sun bake ) once it's up to temp, leave for around 30 min or so to loosen that chemical they used to release from the mold. If this stuff hasn't been clean from your parts, your paint will peel in a few years or sooner.
2, Wash in hot water and soap
3, Scotch brite gray pad (800 grit) with bumper paste.
4, Wash in hot water again. Let dry.
5, Wash with anti static wash, let dry.
6 Apply adhesion promoter
7, Sealer
8, Base, than clear with flex agent.

He said if you follow these steps, your paint will not peel.
Hope this helps..





jmd_forest wrote:It is just that one spot on the bumper that went bad everything else on the rest of the bumper and the other 3 pieces cam out quite nice.

I've got a small run in the clear on 1 fender that I plan to sand out and buff. The bumper cover is another story. I think I'll just sand out the crack, fill in with acrylic glaze, sand smooth, and try blending into the surrounding area.

Any other repair techniques that do not involve stripping the whole bumper (did that once already) would be welcome.

The primer laid down perfect on this cover after stripping off the first primer disaster and re-prepping the cover. It should have been a perfect base to apply the finish coats.

jmd_forest

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PostPosted: Sun Mar 01, 2009 12:25 pm
dude, quit playing and take that grape vine off of that fresh clear :lol:

j/k. that looks very weird

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PostPosted: Sun Mar 01, 2009 12:51 pm
the product that i use is called 6249 plastic adhesion promoter they also have 6246 in an aresol can the big trick is not to put to much on just on thin!!!wet coat all ya gotta do is get enuff on for it ta bite the plastic then go into your sealer or surfacer i dont even have ta sand my raw covers :shock: just clean em real good with hot soapy water btw the stuff i use is availible at napa under the martian senour line think of it as spraying a pvc pipe cement ya get a chemical bite ta the plastic then ya step right into your paint just dont use it over anything pre primed.if your doing a pre primed plastic then just scuff an shoot sealer then base hope this helps
if its blended its splendid



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PostPosted: Sun Mar 01, 2009 4:44 pm
Thank you all for your replies. Many of the tips you provided I had actually done before shooting: Washed and dried well, scuffed, washed well again, light coat of Bulldog, 2k primer with flex, wet sanded the 2K with soapy water and let dry overnight.

Funny comment about the grapevine, that is exactly what it looks like. But...its in the pearl coat and I think right down throtgh o the 2K primer. That picture was taken before the clear.

BondoMerchant, who makes that adhesion promoter you mentioned? I don't think I'll be using Bulldog again.

I'm going to try and spot repair it. If it doesn't come out, I'll reshoot the whole bumper. Hope I have enough paint left.

jmd_forest

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PostPosted: Sun Mar 01, 2009 5:09 pm
martin senour ya can get it at napa
if its blended its splendid
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