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Grit on bare metal #5463762 06/27/20 12:03 AM
Joined: May 2017
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Nazz786 Offline OP
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Hi folks.

regards to bodywork paint topic.

Can you pls advice:

I have a car panel that's brought down to bare metal using 40grit. Now it has 40grit scratches. NO bodywork or fillers required. Just 1k or 2k primer and paint.
Question: Do I need to sand the bare metal further with 80 right up to 240 grit before spraying the primer?

the purpose is for the primer to have good mechanical adhesion but also not not show scrarch marks through the paint later in on.

what should do use
thanks

Re: Grit on bare metal [Re: Nazz786] #5463774 06/27/20 12:38 AM
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Blkstanger Offline
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Is this a car? If I were doing it I'd be down to 320 before primer


99 Jeep WJ 4.7 205,000mi. Maxlife 10w30, Fram Ultra.
15 Ford Escape S 2.5, 81,000mi. Castrol Edge 5w30 Fram Ultra.
Re: Grit on bare metal [Re: Blkstanger] #5463782 06/27/20 01:13 AM
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Nazz786 Offline OP
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Yeah. it's a car panel. Thx for the reply.

So Im guessing I should progressively sand the bare metal panel frm the current 40grit marks up to 320grit.
Then clean the panel with wax n oil degreaser, then it should be good for primer.



cool

Re: Grit on bare metal [Re: Nazz786] #5463852 06/27/20 06:07 AM
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Trav Offline
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No point in removing too much metal, surface scratches are not removed at that level they are removed by "blocking" the primer.
Go over it lightly with 80 grit no finer that that for better adhesion, prep sol it and a final wipe with alcohol then use a quality DTM/Epoxy primer follower directly by a couple of heavy coats poly primer.

Let this cure a few days for best results, the primer show the 80 scratches but now you can work them out with finer paper without removing any metal. Work it down with 400 and water and finally 800 and water (a couple of drops of dawn will help keep the paper from loading up) so its like glass then you can spray color or color/clear depending on the type of paint.
Do not use a talc based primer directly over the metal or go cheap on the primers, spending the money here will pay dividends over the years.


2cents


ASE L1, Master. Deutsch Meisterbrief.
Re: Grit on bare metal [Re: Trav] #5463877 06/27/20 06:50 AM
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PimTac Offline
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Originally Posted by Trav
No point in removing too much metal, surface scratches are not removed at that level they are removed by "blocking" the primer.
Go over it lightly with 80 grit no finer that that for better adhesion, prep sol it and a final wipe with alcohol then use a quality DTM/Epoxy primer follower directly by a couple of heavy coats poly primer.

Let this cure a few days for best results, the primer show the 80 scratches but now you can work them out with finer paper without removing any metal. Work it down with 400 and water and finally 800 and water (a couple of drops of dawn will help keep the paper from loading up) so its like glass then you can spray color or color/clear depending on the type of paint.
Do not use a talc based primer directly over the metal or go cheap on the primers, spending the money here will pay dividends over the years.


2cents





This.


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Re: Grit on bare metal [Re: Trav] #5463900 06/27/20 07:25 AM
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Nazz786 Offline OP
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Ok tq for the know how banana

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