Plastic bumper guards

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PostPosted: Sun Dec 10, 2023 12:20 am
I'm attempting to repaint 2 bumper guards.
I sanded the OEM and had a few burn thrus to the plastic. Primed and painted but keep getting the edges crinkling where I had my burn thrus. Should I just take it all down to the plastic? Also doing this in below 60 degree weather. thanks

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PostPosted: Sun Dec 10, 2023 8:02 am
Common problem.

Usually too heavy an application of primer and/or topcoat over exposed feathered edges.

Use a 2 pack primer preferably and spray in multiple very light coats with more than recommended flash times. Allow the primer to fully cure before sanding and top coating, again with light coats. If using a 1K primer then same procedure but even lighter coats and allow plenty of flash time between coats plus allow to fully dry.

60F is about 15C, so a bit borderline. Use fast reducers and hardeners. Don't pull gun back to lighten coats - this will just result in a dry finish. Instead go in at 150-200mm and move a bit faster.
Chris



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PostPosted: Sun Dec 10, 2023 2:04 pm
Epoxy or urethane primer. Tried both so far. The urethane seemed to react more. Was thinking of putting a thin scim coat of Bondo over the flat area cause it's not so flat. Thanks v

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PostPosted: Sun Dec 10, 2023 6:53 pm
Yes, the urethane has more thinners in it than the epoxy but the problem is putting it on too thick so the thinners soaks into the exposed edge and fries it up. Light coats, fast reducer and hardener and lots of flash time.
Chris



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PostPosted: Sun Dec 10, 2023 11:01 pm
Yup,Worked great. I had same issue when shooting my panels ..you helped me out...I need to keep notes better so I don't ask the same questions. Thanks for your help. V

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