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Old 29 Aug 2016, 08:42 am
Gkon's Avatar
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Default Question for the Paint Gurus

I recently repaired a tear in my front bumper and then painted it.

The bumper was stock (unpainted) for an '02 Limited Edition.

I sprayed it with 3 coats of Adhesion Promoter




And then 3 coats of Bumper Coating


I've noticed some sanding marks that I didn't fully get out of the bumper before painting. I plan on waiting a week for the paint to fully cure, and then sand that area smooth and repaint. (I figure that I will need to repaint the entire bumper to make sure the color is even, right?).

Here is the question:
After sanding is complete, will I again need to spray 3 coats of Adhesion Promoter prior to the Bumper Coating, or can I just spray on the Bumper Coating?

Is the Adhesion Promoter only necessary when preparing to paint over the stock, plastic bumper, or should it and can it be sprayed over the existing Bumper Coating?

Thanks!
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Old 29 Aug 2016, 08:53 am
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Default Re: Question for the Paint Gurus

At this point you did a great job.
I would lightly sand. Use paintable primer on the area you repair and wet sand with 400. Then lightly wet sand the whole bumper with 600. Re-mask the complete bumper and re-shot with a semi black Krylon
Krylon 51603 Semi-Gloss Black
Spray normally for the first couple of coats. Then your final coat fan spray to give a slight textured finish.

You should not (and I do not recommend )need to use any clear.

I use Krylon super or color max even on Ploy's and they stick like it was bonded into the material. Also on some none auto projects I use synthetic oil and greases for lubricating and the Krylon is not effected by them.

Noted that in many project I respond with Rust-Oleum paints. However regarding plastics and ploy's I have found that Krylon is a better more durable paint to use especially is chemical may come into contact with the material painted.t.
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Last edited by NitroPT; 29 Aug 2016 at 08:55 am.
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Old 29 Aug 2016, 09:07 am
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Default Re: Question for the Paint Gurus

Quote:
Originally Posted by NitroPT View Post
At this point you did a great job.
I would lightly sand. Use paintable primer on the area you repair and wet sand with 400. Then lightly wet sand the whole bumper with 600. Re-mask the complete bumper and re-shot with a semi black Krylon
Krylon 51603 Semi-Gloss Black
Spray normally for the first couple of coats. Then your final coat fan spray to give a slight textured finish.

You should not (and I do not recommend )need to use any clear.

I use Krylon super or color max even on Ploy's and they stick like it was bonded into the material. Also on some none auto projects I use synthetic oil and greases for lubricating and the Krylon is not effected by them.

Noted that in many project I respond with Rust-Oleum paints. However regarding plastics and ploy's I have found that Krylon is a better more durable paint to use especially is chemical may come into contact with the material painted.t.
Hi Nitro. Thanks for the compliment and the info. It's much appreciated.

I'm sure Krylon is good stuff given your experience with it, but I want to keep the brand and color I've just sprayed (Duplicolor Charcoal Gray), I'm not looking to change it. I just want to smooth out the rough sanding marks that I didn't see till after I painted and then repaint with the same color. I just don't know if I need to reapply Adhesion Promoter over the Duplicolor, or if Adhesion Promoter is only used on bare, plastic bumpers.

Thanks!
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Old 29 Aug 2016, 09:49 am
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Default Re: Question for the Paint Gurus

So I was wondering about cleaning/detailing after this repair is finished (GREAT JOB Gkon!).
Now that the bumpers are coated with the Duplicolor Bumper Coating, are they treated as a painted surface, or is bumper coating a different material which would allow you to use plastic related detailing/protectant products?
I think Nitro may have addressed this in the past on a different thread (once it's painted - it's paint).
I have this on the to do list; and in Florida wax or UV protectant products are a must.

Peter
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Old 29 Aug 2016, 10:01 am
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Default Re: Question for the Paint Gurus

Far as the adhesion promoter reapplication. If you sand through the paint spot the area with promoter. And prim or paint as you planed.
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Old 29 Aug 2016, 10:06 am
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Default Re: Question for the Paint Gurus

Quote:
Originally Posted by PGBCruiser View Post
So I was wondering about cleaning/detailing after this repair is finished (GREAT JOB Gkon!).
Now that the bumpers are coated with the Duplicolor Bumper Coating, are they treated as a painted surface, or is bumper coating a different material which would allow you to use plastic related detailing/protectant products?
I think Nitro may have addressed this in the past on a different thread (once it's painted - it's paint).
I have this on the to do list; and in Florida wax or UV protectant products are a must.

Peter
I have the same question.
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Old 29 Aug 2016, 10:09 am
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Default Re: Question for the Paint Gurus

Quote:
Originally Posted by Busted_PT View Post
Far as the adhesion promoter reapplication. If you sand through the paint spot the area with promoter. And prim or paint as you planed.
Thanks, Busted_PT

So, just to make sure I get it, if I sand through the area back down to plastic, just spot spray adhesion promoter on that area only, and then repaint the whole bumper again. No need for Adhesion Promoter on the still painted surfaces, Right?

(I know, that's what you said, but I just like to be 100%).
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Old 29 Aug 2016, 10:13 am
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Default Re: Question for the Paint Gurus

Quote:
Originally Posted by Gkon View Post
Thanks, Busted_PT

So, just to make sure I get it, if I sand through the area back down to plastic, just spot spray adhesion promoter on that area only, and then repaint the whole bumper again. No need for Adhesion Promoter on the still painted surfaces, Right?

(I know, that's what you said, but I just like to be 100%).
Danny and I are talking live about this hang tight...
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Old 29 Aug 2016, 10:17 am
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Default Re: Question for the Paint Gurus

Quote:
Originally Posted by NitroPT View Post
Danny and I are talking live about this hang tight...
Awesome! Thanks.
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Old 29 Aug 2016, 10:50 am
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Default Re: Question for the Paint Gurus

Soo............. we have 2 thoughts...one is just spray with the final paint and the other is if you cut down to the plastic use the promoter.

There are good reasons and thoughts supporting for either.
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