Acrylic Lacquer over Urethane paint. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-15-2008, 02:53 AM
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Acrylic Lacquer over Urethane paint.

I,ve painted in SS acrylic urethane I want to apply the black out around the door windows frames, rad wall etc. The black is a ACRYLIC LACQUER semi gloss which is going over the 3 week cured au.
Questions:
Do I need to completely sand the au to remove any gloss from the au topcoat? I was thinking 600 wet?

Its very difficult to sand right up to the paint line before masking! Any tips?

Can I wipe the au with reducer prior to painting the black to help adhesion?

Thanks

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Old 03-15-2008, 09:47 AM
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Just scuffing the panel good with 600 is fine.

Brian
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Old 03-15-2008, 11:51 AM
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Lacquer can lift an wrinkle enamels and urethanes. I would consider spraying and epoxy sealer barrier coat at the least, or consider using a flat urethane, adding flattner to a urethane or a flat clear over a more compatable base. Use a wax and grease remover to wipe down for prep, its what is designed for the job, lacquer and reducer may not remove impurities and flash off too fast.
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Old 03-15-2008, 12:54 PM
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If the urethane clear is cured and isn't scratched or sanded thin you can shoot lacquer over it without any worry of lifting. That is why the light sanding or scuffing with 600 is all that is needed.

Brian
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Old 03-15-2008, 09:12 PM
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I would scuff with a 3M gray scuff pad until the surface is dull then wash with a was and grease remover and apply 3 light coats of paint
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Old 03-16-2008, 03:39 AM
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Tried it out today seems ok apart from the edges it doesnt adhere to well and flakes off. The edges to the au obviously aren't scuffed enough and it does stick to the glossy parts at all.
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Old 03-16-2008, 08:14 AM
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Sorry, we could have given you a little more info. Here is tip on masking that sort of thing. Reverse masking (click here)

And getting up to the edges of the tape is always a challenge. I like to cut up a gray scuff pad with a razor into little one inch squares. I then have a bunch of nice clean sharpe edged scuff pads I can scuff the paint right at the tape edge with. I switch from very slightly worn side to nice and fresh so I always have a nice sharp edged pad to be sure to get right up to the tape.

Brian
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Old 03-17-2008, 03:52 AM
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Black Lacquer applied after scuffing but my masking paint line needs work!!
Any tips on fixing this?



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Old 03-17-2008, 07:31 AM
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If you want to fix it, just move down a hair and put a new line and re-paint the area. However, does't it get covered there?

Brian
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Old 03-17-2008, 07:36 AM
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It does look like the weather strip will cover that area. If you need a really nice clean line use fine line tape(3M blue vinyl) and mask back from that.
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Old 03-17-2008, 08:21 AM
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Yeah, go to the link I provided.

Brian
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