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Final Sanding
#1
I laid my final coat of K38 Hi Build primer. Any suggestions what I should use to sand before putting down final coat?? I was thinking wet sand with 500 grit. Your thoughts??

Thank you all in advance . have a great weekend!!
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#2
Is that the final primer before paint or what? If it is, wet sand with a 500 should be fine Smile

Daniel thumb

Pro-Touring 1973 Mustang named ''Creator'' ... Tongue
Under construction!!
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#3
protouringstang73;194144 Wrote:Is that the final primer before paint or what? If it is, wet sand with a 500 should be fine Smile

Sorry , i left that out. Its final prime before color.

thanks!
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#4
Or maybe it was me who did'nt read it right.. Big Grin Are you doing all the paint by your self? Smile

Daniel thumb

Pro-Touring 1973 Mustang named ''Creator'' ... Tongue
Under construction!!
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#5
protouringstang73;194166 Wrote:Or maybe it was me who did'nt read it right.. Big Grin Are you doing all the paint by your self? Smile

Yes. I used to paint quite a few cars 25 years or so back. I was a little intimidated by all the new products that came out since then , but i am warming up to them pretty quick. The products i have work with so far are so much better in my opinion.
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#6
Sounds cool, I am also doing all the paint job on my car.. Smile

Ooh yes, danm all those products there are on the market right now, it is not allways easy to know what product to use.. Big Grin But there are so many great products these days as you are saying.. Are you guys using water based paint over there, or what?

Daniel thumb

Pro-Touring 1973 Mustang named ''Creator'' ... Tongue
Under construction!!
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#7
Manyo,

It works this way.

You have already laid down a few coats of primer filller to start off with. You guidecoat, and then do all your block work sanding. In your case, you have decided to lay down more primer filler over what you had already put on, because of rub through issues and the like. At this point, you may choose to do a little bit more block sanding or not.

The main point now is, that you must prepare your primer filler for your color coats, by hand sanding wet, (without using any blocks) the entire surface with 800 Grade wet & dry. Using a coarser grit like 500 could cause sanding scratch marks that will appear in your finished color coats. If that happens, you will have no choice but to refinish your panels again. That is something you don't want to happen. Sanding scratch marks will appear in your metallic and pearl finishes . Solid colors on the other hand should tolerate the use of 500 grade to do the final rub down before color, but i would still stick to using 800w&d, wet.

Before you move into hand sanding for your final color coats, lay down a fine coat of black guide coat. That will help you to see any imperfections in the primer filler. Once the guide coat has been sanded away, as well as any imperfections, there should be no real need to keep on sanding.

Also, make sure when you hand sand down, keep your fingers together. If you spread them, you will get tram track marks in your final finish. Use the palm of your hand, and/or the fingers that are closed together, when free hand sanding down in wet or dry sanding applications. Sanding in circular motions produces good even results as well. Don't sand in forward/ backwards straight lines fashion.That causes uneven sanding marks as well.

Hope that helps,

Greg.Smile (Pro painter.)

whistling LORD, MR FORD - JERRY REED
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#8
You are right Greg.. 500 is fine for solid colors and a highter grit like 800 would be better for a metallic color.. Maybe I should have asked what color he was going to use before I wrote my answer.. Smile It has just worked fine for me with a 500..

Daniel thumb

Pro-Touring 1973 Mustang named ''Creator'' ... Tongue
Under construction!!
  Reply
#9
[quote=protouringstang73;194200]
You are right Greg.. 500 is fine for solid colors and a highter grit like 800 would be better for a metallic color.. Maybe I should have asked what color he was going to use before I wrote my answer.. Smile It has just worked fine for me with a 500..
[/quote

Thanks Daniel, it's all good.Smile

Greg.Smile

whistling LORD, MR FORD - JERRY REED
  Reply
#10
Austin Vert;194176 Wrote:Manyo,

It works this way.

You have already laid down a few coats of primer filller to start off with. You guidecoat, and then do all your block work sanding. In your case, you have decided to lay down more primer filler over what you had already put on, because of rub through issues and the like. At this point, you may choose to do a little bit more block sanding or not.

The main point now is, that you must prepare your primer filler for your color coats, by hand sanding wet, (without using any blocks) the entire surface with 800 Grade wet & dry. Using a coarser grit like 500 could cause sanding scratch marks that will appear in your finished color coats. If that happens, you will have no choice but to refinish your panels again. That is something you don't want to happen. Sanding scratch marks will appear in your metallic and pearl finishes . Solid colors on the other hand should tolerate the use of 500 grade to do the final rub down before color, but i would still stick to using 800w&d, wet.

Before you move into hand sanding for your final color coats, lay down a fine coat of black guide coat. That will help you to see any imperfections in the primer filler. Once the guide coat has been sanded away, as well as any imperfections, there should be no real need to keep on sanding.

Also, make sure when you hand sand down, keep your fingers together. If you spread them, you will get tram track marks in your final finish. Use the palm of your hand, and/or the fingers that are closed together, when free hand sanding down in wet or dry sanding applications. Sanding in circular motions produces good even results as well. Don't sand in forward/ backwards straight lines fashion.That causes uneven sanding marks as well.

Hope that helps,

Greg.Smile (Pro painter.)
Way to dispense the knowledge Greg. Good stuff mate hope the OP slips you a few rep points for sound advice thumb

He has all the vices I admire and none of the virtues I despise
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