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Old 10-18-2006, 04:36 PM
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Clear coat sandthrough

I had to reclear a hood that had been painted about 2 weeks due to scratch damage that would not completely sand out. What we did was sand the 2 week old clear with 600 and then sprayed one wet coat of Nason 496 which is a quick drying clear for panels. Since this is not an overall clear I got some dry spots that will need to be sanded and buffed and I am concerned that with only the one coat of new clear that sanding through to the older clear may be a possibility. If this happens can it cause problems similar to the edge that can occur when blending clear? I wanted to apply a second coat but the owner said he already 3 coats from the first time 2 weeks ago and was concerned about getting too much clear build up.

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Old 10-18-2006, 05:08 PM
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Yeah you don't want to sand through that clear into the older stuff. It will defignately be a noticeable spot if you do. Been there done that. You should of put on more then just 1 new coat. Having a hard time thinking how to describe it. You should of just sprayed on 2 without telling him. Specially when you seen you had dry spots in the first coat. Just normal wetsanding and buffing you will be sanding off a good amount of that one coat, so how much is it really adding over 1 coat? I just picked up some 496 today to fix a hood I have to redo cause of solvent pop. Hope the 496 won't cause me problems, but I think that was the nason 496 I used on another hood at one time, and didn't have problems with dry spots. I do use the high temp activator though. I was juggling between picking up the 497 overall and 496 and decided to go 496 for faster dust free time, and temps are cooling off around here.
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Old 10-18-2006, 08:50 PM
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I tried to explain that we had sanded off a lot of the first clear in the attempt to clean it up but he insisted that the one wet coat would be enough. He had sprayed it at home and did a decent job except for a small amount of dust and some light orange peel but when he sanded it with 1500 he got some grit under his paper and made a real mess. He brought it over to my place so we could shoot it in a cleaner environment but I am afraid he is worse off now than before.
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Old 10-18-2006, 08:51 PM
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I would stay with 1500 and go with the Perfect It II regular cut compound and a good wool buff.
The 1500 will take care of your dry spots and the II & wool pad will cut the 1500 best and quick so's not to cut thru your 1 coat.
"If" you have the 3000 Trizact pad,that would be even better after the 1500 and you could use a foam waffle pad instead.You can try the waffle pad but IMO it won't cut the 1500 well and you'll end up overworking some spots.
Be sure to tape your edges......
You go after 1 coat with 600-1000 and your asking for trouble depending on how thick you sprayed it. I've had no problems with 1 coat BUT, I was laying it with the LPH-400 and I know it was good millage to cut.
I've used Nason under all kinds of extreams,multiple coats, and it's never poped on me yet as long as my base was flashed good. That happened once and it was my fault and what I got for being in too big a hurry when it was cold on a black base.
The 496 is notorious for dry spots even with the slower cat,It's great for multiple coats,quick dry and your sanding anyway but on large panels like hoods or completes,it's 497 always. AND,
2 coats min. Always.
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Old 10-18-2006, 09:01 PM
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I used my IWATA 400 and laid it on heavy BUT it is still just one coat, I will do like you said and hope for the best.
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Old 10-18-2006, 09:12 PM
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You'll be fine, You "should" have the worst of it sanded out BEFORE this last coat anyway and you don't "have" to get all the o'peel out to still make it look great. Give it that Better than OEM look.

It won't hurt to have both wool and foam pads,which is what I do all the time. Wool on the easy parts and foam on the "oops" areas. Lot less chance of an oops.
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Old 10-18-2006, 09:36 PM
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It wasn't nason that I got the pop in. But it was in the upper 90's that day and I didn't have the slowest activator. The base should have sat plenty long, one color overnight, the other probably about 6 hrs or so. Customer always knows best, I might of sent em on his way if I was doing a job and he was telling me how to do it after he messed up the first time, specially knowing better that one coat only could really be asking for trouble.

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Old 10-19-2006, 07:07 AM
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This was just a freebie(like almost every job I do ) for a friend of mine and he decided on the one coat AFTER I started spraying. I think he saw what he thought was a really slick finish and decided to leave it at that, that's what I get for allowing him to watch.
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