Shrinking problems?
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I have been working at this shop for 2-3 months now. We did some hail damage repair on a 1500 Ram big horn the fancy one lol. I prepped the truck for paint, blocked the primer, and prepped for blends. Then masked it off. I noticed while blocking the repairs some rather large sand scratches, other then that all looked great when it headed for paint. Then the painter sprayed a real dirty job, and failed to clean it up enough for the customer to accept it. They tried to send it, didn’t work. So he re shot the hood off the truck, and wet sanded and buffed the whole thing with help and it looked good.
As I was headed to my car, I seen the truck and the manager talking, and a few spots of tape on the hood. I walked over and seen the 80ish or so da sand scratches in the base. This means the surface I prepped flat and smooth, and was never an issue shrank and now looks to be like just another issue this shop is having.
I know the body guy likes to mix the regular bondo with the polyester filler, and that is the first thing I can think of other then primer shrinkage.
Either way all I did was sand the bitch flat and smooth, I just would like to be like this is what went wrong. Please take your issues to the heart!
if you can see the 80ish sand scratches means the polyester wasent finished with a fine enough grit (320) and the primer wasent left long enough to shrink before you block sanded it. you cant expect the primer to do too much.
The primer sat over night, and I have been noticing some really rough body work. I have been filling in for the last few weeks in mechanical, and didn’t spend but a few weeks in the paint department.
This is a real hack shop, and I am pissed for one to wrenching all day. Not what I was hired for.
I did nothing but what I was told, sand and tape this for paint. My main purpose is to clear me of wrong doing. It was the filler, I think it’s because they blend the polyester with the other filler which idk the kind off hand, but it isn’t a poly.
Everything is going wrong and I am the new guy, but this is what I walked into. I was just looking for some technical support to defend myself if needed in the morning. Like I said my blocking was good and the guy never complained about highs lows waves etc. But he did pick out all the dirt and unbuffed sand scratches left by the existing painter.
to coarse sanding scratches for primer, primer not flashed properly between coats..
If the primer was put over 80g scratches then its going to shrink. A urethane primer can not be expected to fill an 80 scratch in filler. Usually 150-180 grit or finer is what you want.
Smooth nailed it,poor prep on bodywork and feathering out the paint.Overnight is sometimes not enough time for primer to shrink,but in a prduction shop time is money,everything has to go yesterday,that is why you have to take extra time to finish filler and old paint in the right grit.If all you did was sand the primer and mask, it goes back to the bodymans problem.Bodyfiller and pourable polyester putty are compatible and can be mixed together to change the consistency,done that for years and it is not the problem.So what happend is you prepped it for paint and sanded the primer smooth,then the primer continued to cure and sink back into the scratches and minor low spots leaving you with your problem.The next time you prime something leave some in the bottom of the can and see what happens to it over the next few days and you will be surprised at how much it shrinks,every brand does it.HTH :cheers
That is what I though, so no matter who sanded it problems still there.
I was curious as to the mixing of fillers, thanks for filling me in. No Pun intended.
Now I have to face the issue I seen when I started, hacks. :unsure:
Sucks with this economy took me 4 months to find a job.
is the body guy mixing the filler and poly together to try and skip a second step of applying a glaze over the repair? perhaps changing the filler brand to a more premium resin might help. i recently began using platinum plus filler and not only do i no longer need to cut with anything below 80 grit, i can actually finish with 180 and higher without the need for polyester glaze.
btw i notice your in New Jersey and 4 months to find a body shop job? wow! did you try craigslist?
Yeap, and found plenty of fill in work.. Seen a few jobs come, applied with portfolio and everything. Nothing for 4 months.
He liked the way it spread better, but he hasn’t impressed me yet. I am no body king, but I got a decent eye and fingers. The thing is he has been working their for years, and this is his body work. :blink:
I have seen quite a bit of this, and from what I have found most of it is due to the bogyman hammering the primer on without letting it breathe. Kind of keep an eye on what the body guys send you and you will notice trends, some guys will finish their work off better than others. And maybe try using a dry guide coat, not that it will prevent the shrinkage but more of an insurance policy to know that you did everything that you could to make sure it was going to be right.
in my shop i take on a job and my partner takes on a job, i like doing this because it takes out all the guess work from passing the job from me to him . that way i can follow it all the way to the end with no surprises. i know thats not what all bodyshops do but that the way i like doing it. if their is a mishap we know whos to blame.
[quote=”smooth” post=21563]in my shop i take on a job and my partner takes on a job, i like doing this because it takes out all the guess work from passing the job from me to him . that way i can follow it all the way to the end with no surprises. i know thats not what all bodyshops do but that the way i like doing it. if their is a mishap we know whos to blame.[/quote]
I work at a small GM dealer. There is myself and 1 other guy in the shop. We work the same way, doing our own jobs start to finish. Works out great for the both of us, the quality is very good and I can’t remember any comebacks from our work.
…although we seem to be getting quite a few comebacks from the painter that worked there before me. :chair
like others said the primer wasn’t finished cureing. what happens, is the bodyman puts 20 coats of primer on in one shot, blocks, sends to us, we prep, no problems, i paint no problems, i bake, and bam. but of corse it’s always the painters fault. after all it was perfect when it came over.
c’mon man learn your role. 🙂
[quote=”lild” post=21586]… the bodyman puts 20 coats of primer on in one shot…[/quote]
wow, your bodymen must be super skilled! :rofl
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