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Thread: Painting on plastic

  1. #1
    Join Date
    Mar 2021
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    23

    Default Painting on plastic

    So this is what I got:

    I sanded this grille to the factory paint..
    Cleaned, tacked, primered, then sanded with 600..
    Three coats of nason base, then three coats of nason clear (with appropriate timing).
    A couple hours later I carefully remove the masking and the very last piece of tape takes some paint with it.
    I put adhesion promoter between coats as well.
    I’m thinking I should have left the primer at 400. It just looked so pretty and I got carried away.

    I guess I’m looking for advice on how to move forward and avoid doing this again.

    89CA13BE-C5E8-4B7F-B222-F1DC5E8666F2.jpg

    BD3A18EF-0581-41BF-A2D5-DA9534212488.jpg

  2. #2
    Join Date
    Nov 2005
    Posts
    19,146

    Default Hmmmmm....

    Quote Originally Posted by SFLAutoSurf View Post
    So this is what I got:

    I sanded this grille to the factory paint..
    Cleaned, tacked, primered, then sanded with 600..
    Three coats of nason base, then three coats of nason clear (with appropriate timing).
    A couple hours later I carefully remove the masking and the very last piece of tape takes some paint with it.
    I put adhesion promoter between coats as well.
    Iím thinking I should have left the primer at 400. It just looked so pretty and I got carried away.

    I guess Iím looking for advice on how to move forward and avoid doing this again.

    89CA13BE-C5E8-4B7F-B222-F1DC5E8666F2.jpg

    BD3A18EF-0581-41BF-A2D5-DA9534212488.jpg
    I think this was your weak link:

    "I put adhesion promoter between coats as well."
    Now, you can let it sit and see if it all hardens. Maybe after a day, see if your fingernail sinks.

    Drying is not so much what you're after as is CURING of the products and I'm not sure if the addition of the AP will allow CURING to happen properly.

    Hopefully, others will chime in. Keep us posted as we all wish for the best outcome.

    Henry

  3. #3
    Join Date
    Nov 2005
    Posts
    45,325

    Default

    I think Henry is right your adhesion promoter should be applied to the plastic before the paint is applied.

    You can try to feather the problem area then reapply the AP and paint but you might want to consider removing all of the paint and starting over and apply your AP directly on the sanded plastic. Depending on what products you're using the AP is applied, allow to dry a little then applied again and allowed to dry then paint is applied. Read the technical data sheet (TDS) for the AP that you're using.

  4. #4
    Join Date
    Mar 2021
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    23

    Default

    Quote Originally Posted by Henry View Post
    I think this was your weak link:

    "I put adhesion promoter between coats as well."
    Now, you can let it sit and see if it all hardens. Maybe after a day, see if your fingernail sinks.

    Drying is not so much what you're after as is CURING of the products and I'm not sure if the addition of the AP will allow CURING to happen properly.

    Hopefully, others will chime in. Keep us posted as we all wish for the best outcome.

    Henry
    I was afraid that might be the case. I wasnít sure where along the process the ap should go so I figured it couldnít hurt.

  5. #5
    Join Date
    Nov 2005
    Posts
    19,146

    Default Yes sir...

    Quote Originally Posted by SFLAutoSurf View Post
    I was afraid that might be the case. I wasnít sure where along the process the ap should go so I figured it couldnít hurt.
    What LEN says!

    Also, this is a grill, The only time it gets touched is when you wash the car or kill bugs going down the road. If mine, I might (and have) bypassed the AP process with no ill effects.

    If this is being done for yourself then consider leaving it as is and keep an eye on it. If it holds up and DOES bond then you'll be ahead of the game. Worst can happen is it begins to delaminate and even at that, you can pick WHEN you sand it down and do it over again.

    Hey, PRETEND you're in VEGAS and 'gamble' a little bit. (Unlike if this was for a customer, you'd have to fix it quickly.) So all is cool plus you learned something. Keep us posted regardless and thanks.

    Henry

  6. #6
    Join Date
    Nov 2013
    Location
    olympia,wa
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    1,711

    Default

    just thought i'd add, you can apply the masking tape on your pant leg before putting it on your project to reduce it's level of adhesion. it's not a cure for adhesion promoter between coats, just a thought for future use if you think you are going to pull paint.
    b marler

  7. #7
    Join Date
    Nov 2005
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    19,146

    Default Yes sir...

    Quote Originally Posted by bmarler View Post
    just thought i'd add, you can apply the masking tape on your pant leg before putting it on your project to reduce it's level of adhesion. it's not a cure for adhesion promoter between coats, just a thought for future use if you think you are going to pull paint.
    Very good REMINDER of an old trick we all learned from our mentors along the way!

    Thank you for resurrecting something good that all should know. It does have its place in this work!

    Enjoy your weekend! Do something for YOURSELF...

    henry

  8. #8
    Join Date
    Mar 2021
    Posts
    23

    Default Yep

    I Definitely could’ve avoided this by being more careful when pulling the tape. Luckily this is for my truck and I’m not worried about appeasing a customer. It seems to be curing just fine and ’m pretty sure I can lightly sand and re-spray the area and have it look right. I’m just pretty new to this and was surprised at how thin the paint and clear coat seems to be. The front bumper and mirrors turned out well but now I have four doors and a hood to do so I wanted to make sure I knew what probably happened before I move forward.
    Last edited by SFLAutoSurf; 03-14-2021 at 08:55 AM. Reason: Horrible Grammer

  9. #9
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    Nov 2013
    Location
    olympia,wa
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    Default

    Quote Originally Posted by SFLAutoSurf View Post
    I Definitely couldíve avoided this by being more careful when pulling the tape. Luckily this is for my truck and Iím not worried about appeasing a customer. It seems to be curing just fine and ím pretty sure I can lightly sand and re-spray the area and have it look right. Iím just pretty new to this and was surprised at how thin the paint and clear coat seems to be. The front bumper and mirrors turned out well but now I have four doors and a hood to do so I wanted to make sure I knew what probably happened before I move forward.
    don't worry, no grammar police here.
    b marler

  10. #10
    Join Date
    Nov 2005
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    19,146

    Default Hmmmmm.... TAPE ?

    Quote Originally Posted by SFLAutoSurf View Post
    I Definitely couldíve avoided this by being more careful when pulling the tape. Luckily this is for my truck and Iím not worried about appeasing a customer. It seems to be curing just fine and ím pretty sure I can lightly sand and re-spray the area and have it look right. Iím just pretty new to this and was surprised at how thin the paint and clear coat seems to be. The front bumper and mirrors turned out well but now I have four doors and a hood to do so I wanted to make sure I knew what probably happened before I move forward.
    Curious, are you using autobody tape as there is a huge difference. The wrong stuff helps lead to problems.

    Had to ask to cover that important variable. Carry on!

    henry

  11. #11
    Join Date
    Mar 2021
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    23

    Default

    Quote Originally Posted by Henry View Post
    Curious, are you using autobody tape as there is a huge difference. The wrong stuff helps lead to problems.

    Had to ask to cover that important variable. Carry on!

    henry

    Iím using 1/2Ē automotive tape from advanced auto. Like I said I know it was user error. I got impatient and pulled it too fast. Iím just starting to worry about the rest of the paint now. Didnít expect that it would be so fragile.

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