Originally Posted by deadbodyman
The glazing putties are used instead of a fist coat of primer. when you get your bodywork roughed in with 80 most body men Ive seen go right to primer and for your production work I guess that's ok but its still a short cut that can cause problems within a year like scratches swelling up, shrinking and the feather edges around the work swelling, especially on hoods. sure, it looks good when it leaves the shop but a few months out in the sun and everything starts showing up.
Instead of going to primer after 80 you would use the easier sanding poly putty and sand that with 180 then 320. If the scratches and other imperfections like waves aren't there in the first place they cant swell up or shrink, the putty is very good at that. burring it in primer, no so much.
In general I try to do one coat of filler, (sometimes two), sanded with 80 and one coat of putty, (sometimes two) sanded with 180 -320 then prime. sand primer with 320 dry or 400 wet and paint. Everyone wants to rush to get that primer on then they have problems.
I had more trouble learning the filler work than any other part of body and paint work but there were no build primers and poly putties back then just lacquer primer and nitro stain so you didn't leave scratches and what not for the primer to take care of if you did they were 100% certain to come back and bite you so learning took time. The frustration was all part of it.
I agree with everything you said there. Henry is correct in that looking at it a bit different and using a modern high quality filler like Rage Ultra or 3m Platinum Plus does change everything, they are SOOOOO much better than cheaper fillers or the fillers of yesterday. I haven't used them enough but I am thinking the "skim coat" in polyester putty may not be needed as he said. The fact is, the same basic technique should be used as we have described in a "skim coat" like application to finish it off after shaping it. If you can get by without the polyester putty, cool, if not, use it.
What I see is it's still that technique, shaping, then that skim coat to finalize it, THAT is the trick.
In a nutshell, I see guys trying to get it perfect in every application and failing miserably, miserably
. Can some do it, I guess so. But what I see every single day is guys putting on filler, sanding it with way too fine of paper thinking
they are going to finish it off in that one app. They are working way too hard trying to finish it off with fine paper and precise sanding trying to finish it off, only to give up and have to put another application anyway! Then they will do that again, and again, applying filler many times. Then they will send it to the paint dept to have them turn it down because of waves or what ever and it comes back to have them put another
Sure there are guys who can pull it off with one or two coats doing it that way or getting it done with one coat over and over and then every once in a while have to apply another so it's worth it to them. But that is not
the norm of what I see. They apply over and over, period, every time and they are not saving a minute, only spending more time.
I was taught the skim coat method 38 years ago by a very good bodyman and have used it ever sense with great success. I don't care what filler I use, I use the method and it's done me well. Back then we were thinning the filler with fiberglass resin as there was nothing what so ever like polyester putty, it didn't exist in any form. As polyester putty came around I switched to it and never looked back.
But as Henry brought up, I can see skipping it and simply doing the same basic thing with the quality fillers of today. They are like honey, they spread like polyester putty, like Evercoat's "Glaze Coat" polyester putty! They really could be used like this. And I am sure after a while found to on sure time one coat fills not need to be followed up, I am sure they would, they are that good.
The thing is, that is a steep learning curve for a newbe, so the very basic "skim coat" method I have used is what I recommend. It's the most "user friendly" method to finalize and perfect before primer.