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Old 10-25-2009, 03:51 PM
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Plastic bumper disaster

Hi.
I decided to paint my plastic bumper 2day. With my aim to produce a finish that looks like the bumper has been "Back to blacked" (so i dont have to keep applying gels).

All products are aerosol:
plastic primer
matt black paint

With this in mind i gave the bumper a quick sand.
(i didnt degrease as im not that bothered about the finish)
then i applied two coats of my plastic primer. I wasnt sure why but the primer wasnt a colour...it was just clear like laquer. My inexperience told me just to continue.
I then applied two coats of my matt black spray paint.

it looked ok...until it dried and seemed to just return to its normal grey/white unmaintained bumper colour...it was matt black in some areas but then grey/white in others.

i have no idea whats caused it...its like the bumper had absorbed the paint in some areas.

whats caused this problem?

any help is much appreciated as i want to know whats caused it, then i want to solve it.

Thanks for any help

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Old 10-25-2009, 03:56 PM
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did you mix/stir paint before you applied it? any pics?
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Old 10-25-2009, 04:55 PM
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Quote:
Originally Posted by mitmaks
did you mix/stir paint before you applied it? any pics?
sorry no pics will get some though. like i said its aerosol. i gave the cans a good shake yea.
cheers for the reply
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Old 10-25-2009, 06:26 PM
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dewd

its the spray BOMB caned paint has a single stage type of paint in it so no krylon or rustoleum fat black paint is har to find good paint plasi cote has the best rattle can flat black you can paint something then paint it a week later and it blends in good stuff
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Old 10-25-2009, 08:21 PM
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Boosting, do you know what punctuation is? Your post was so poor, I don't think anyone could understand it. Are you stoned or do you normally spell like that?

Wear a respirator in the paint booth, it will improve your train of thought.

Frank Cox
Cox Custom Cars
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Old 10-26-2009, 02:19 PM
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Quote:
Originally Posted by boosting27
its the spray BOMB caned paint has a single stage type of paint in it so no krylon or rustoleum fat black paint is har to find good paint plasi cote has the best rattle can flat black you can paint something then paint it a week later and it blends in good stuff
so are you saying that my paint isnt the correct stuff to use? as in i didnt use plastic paint? i didnt quite understand you dude.
can anyone give me a definite answer??
cheers for any help
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Old 10-26-2009, 04:31 PM
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yea its the cheap paint you used re spray it with plasikote paint.
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Old 10-27-2009, 11:22 AM
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Sounds like maybe it 'blushed'. Was it raining out when you painted it, or very humid?

Also, was the primer good and dry before you sprayed the flat black?

You may have to scuff it and respray the flat black. Be sure to shake the can REAL good. There's no way to tell how long that stuff sat on the shelf before you got it.
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Old 10-27-2009, 12:17 PM
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yea it was raining outside but it wasnt humid. How does humidity affect it?
i made sure the primer was dry...is it supposed to be clear? it also had small speckles in the primer like glitter stuff.
cheers for the replies
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Old 10-27-2009, 01:26 PM
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If it was raining, it was humid. There was excess moisture in the air, which some paints can absorb, and 'blush'. This gives bleached-out looking areas, kinda like primer. It really doesn't hurt anything. I think if you'll scuff the bumper and shoot again, it'll be ok (on a dry day). You might even try buffing over them with an extra fine steel wool. That might take it off.

Many moons ago, a friend and I sprayed my '55 Chevy with Corvette Nassau Blue lacquer on a rainy day. When it dried, it looked like blue primer. I was going berserk, but my buddy told me it had blushed, and to come back the next day. We color sanded it and buffed it out; came out beautiful.
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Old 10-27-2009, 05:18 PM
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Quote:
Originally Posted by dalesy
If it was raining, it was humid. There was excess moisture in the air, which some paints can absorb, and 'blush'. This gives bleached-out looking areas, kinda like primer. It really doesn't hurt anything. I think if you'll scuff the bumper and shoot again, it'll be ok (on a dry day). You might even try buffing over them with an extra fine steel wool. That might take it off.

Many moons ago, a friend and I sprayed my '55 Chevy with Corvette Nassau Blue lacquer on a rainy day. When it dried, it looked like blue primer. I was going berserk, but my buddy told me it had blushed, and to come back the next day. We color sanded it and buffed it out; came out beautiful.
sweet. gonna give it another go over the weekend if i get chance, it must have been the rain like you said. thanks alot for the help Dalesy.
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Old 10-28-2009, 07:27 AM
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I think what you are calling a primer is actually an adhesion promoter. It was clear with a slight glitter to it? I have used an adhesion promoter like this before. Very hard to tell you are coating the plastic, next thing you know you have applied too much. The stuff I used (Standox brand) actually began to distort the plastic door handle I was getting ready to paint. You will need to sand it down and start fresh. If you use the adhesion promoter again it just takes a light dusting. However, I would recommend something like Krylon Fusion paint.
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Old 10-28-2009, 02:19 PM
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Quote:
Originally Posted by triquemfg
I think what you are calling a primer is actually an adhesion promoter. It was clear with a slight glitter to it? I have used an adhesion promoter like this before. Very hard to tell you are coating the plastic, next thing you know you have applied too much. The stuff I used (Standox brand) actually began to distort the plastic door handle I was getting ready to paint. You will need to sand it down and start fresh. If you use the adhesion promoter again it just takes a light dusting. However, I would recommend something like Krylon Fusion paint.
thats exactly what it is i put on a few coats because i cudnt actually see where it had been applied,i only knew from memory.
so do you think this could have caused the paint to react like it has?
cheers for the info
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Old 10-28-2009, 04:30 PM
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Quote:
Originally Posted by Bartman
thats exactly what it is i put on a few coats because i cudnt actually see where it had been applied,i only knew from memory.
so do you think this could have caused the paint to react like it has?
cheers for the info
I would be nearly certain of it based on my prior experience.
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Old 10-28-2009, 05:32 PM
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Some of these plastic adhesion promoters are simple Tolulene.
I would check the indegrents of the "promoter".
Personally,
It's SEM or NOTHING when it comes to spray bombs.Especally plastic or vinyls.
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