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The whole idea behind not removing too much clear is very confusing..
I just watched a YouTube video that basically mentioned, if you do more than polish, you may remove the important top layer of UV protection. With that said, why the need for long throws, rotaries, compounds, etc...Grab yourself a GG 6", polish and finishing pad and you're good to go.
I bought a test hood with OEM Volvo paint. I sanded with 1000 grit several times, sanded with 2000 grit several times, sanded with 3000 grit several times, compounded many times, polished many times and FINALLY went through the clear. Point being, this OEM THIN clear took one hell of a BEATING before it finally went through.
What gives?
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Re: The whole idea behind not removing too much clear is very confusing..
I remember the rule of thumb being that the UV protection migrates to the top half of the clear coat when drying. So you should never remove more than half of the clear. That is, if you have the ability to calculate the thickness of just the clear.
A typical heavy compounding may remove 5-10 microns depending on how deep you need to go. Should have more than half of that top 50% left over.
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Super Member
Re: The whole idea behind not removing too much clear is very confusing..
Without getting too complicated and to give a very basic answer:
After paint cures(more specifically the clear coat) the UVA and UVB inhibitors eventually migrate to the top 30% of the clear coat. That is the part we polish/compound off. This Information comes direct from a local PPG automotive paint rep.
The only product I know that claims to add this protection back to the clear is OCW(with continued use)and I believe that is the main part of the patent for OCW.
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Re: The whole idea behind not removing too much clear is very confusing..
Why long throws? Efficiency. With more power they can do as much in 3-4 passes as a GG6 or PC can do in 5-6. One pass doesn't sound like much but over an entire car it adds up. An enthusiast doing 3 or 4 cars a year might not see a need for that, but pros certainly do. That time savings could mean the ability to correct 2 or 3 cars a week which adds to their bottom line.
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Re: The whole idea behind not removing too much clear is very confusing..
Originally Posted by
pilotpip
Why long throws? Efficiency. With more power they can do as much in 3-4 passes as a GG6 or PC can do in 5-6. One pass doesn't sound like much but over an entire car it adds up. An enthusiast doing 3 or 4 cars a year might not see a need for that, but pros certainly do. That time savings could mean the ability to correct 2 or 3 cars a week which adds to their bottom line.
You're missing my point. With these aggressive machines, you're most likely removing the most important top part of the clear.
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Re: The whole idea behind not removing too much clear is very confusing..
I have a few clients that don't get this. They know that I can remove the swirls that they put in the car, but never seem to care about my warnings that I can't keep doing this and they need to be more gentle with their car.
It kills me to see people constantly polishing their hoods and roof testing coatings and other LSP all the time. Some of you guys are nuts.
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Re: The whole idea behind not removing too much clear is very confusing..
Originally Posted by
DBAILEY
I have a few clients that don't get this. They know that I can remove the swirls that they put in the car, but never seem to care about my warnings that I can't keep doing this and they need to be more gentle with their car.
It kills me to see people constantly polishing their hoods and roof testing coatings and other LSP all the time. Some of you guys are nuts.
Do you own a compound? Serious question.
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Re: The whole idea behind not removing too much clear is very confusing..
Yes, I have probably 6-8 compounds. FG400 is probably my all around favorite.
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Re: The whole idea behind not removing too much clear is very confusing..
If you're at 100 microns total thickness and subscribe to the 25% primer, 25% base color and 50% clear coat then the UV should be in the top 25-30% which would be about 12-15 microns. So there is some room for correction. You're just weakening the clear's ability to block or absorb the UV.
So I guess it's a trade off with obvious limits.
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Super Member
Re: The whole idea behind not removing too much clear is very confusing..
Exactly why I picked up some glaze this time. Gonna try it with 476.
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