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it is totaly pointless to do that .
1st if you prep the car the right way you will not be geting any more peal that what the oe finish has .
2nd if you paint a car then sand it andonly spray one coat more of 22 line you could brake thru the last single coat when your color sanding and buffing . then when you real close to the finish you could very well see little ring from were you did brake thru that single last top coat of the 22 line paint .
so it's not over the top it's totally pointless !
what i'm getting from what your saying is there paint work is so bad they come right out and tell you up front they need to paint your car twice just to get a good paint job .
the things i see and hear shop and people do and say they do to get a show finish totally amazes me .
i my old shops we have built more top show winning cars than i can count and we never ever have done any of the crap i hear people do to get a winning finish .
if you prep the car for it's top coat the right way that is the 1st step to a good finish .
then if they have the right equipment and know how to use it there is no need to spray the car more then once . it goes in the booth and comes back out that's it !
then when it comes to the color sanding and buffing you will be doing that to take out any peal (and there really should be non at all ) and maybe a hand full of little pieces of dust .
i won't even get into a top coat not wanting to stick to or bite into a sanding grit cut any finer than a 1000 at the most 1200 grit .
i just paint the side of my friends lamborghini aventador yesterday . as you know i close up my body shop and i'm now just doing little jobs from time to time in my very small airbrush shop . the air brush shop only has a very old non heated cross draft booth . lambo spends more than 18 hours color sanding and buffing there cars finish after there painted . lambo is known for having one of the finest finishes of any auto maker . when i was done painting it there was no peal to the finish and two pieces of dust as the paint should be right after it's painted . i would never think about now sanding the side of the car back down and remasking it and putting it back in the booth and spraying it again .
when any one is looking at shops to do there work you have to ask all the steps they go thru right from the start to the finiah of there car . how and what products they will be using the steps they will be taking and so on .
because it may come down to who is paying for all the extra needless metarials and time on your car .
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