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Old 05-14-2011, 03:59 PM
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Polyester spray filler

I have a local supplier that's been great in helping me do the right things. I'm filling in the dents on a Mustang roof from hail damage. The more I work it the more I see dents from possible foot prints. I'm going to try something new to me. Polyester filler. I have a siphon type primer gun w/ 1.8 mm tip. I read this type of filler requires 2-4 mm tip and a Gravity gun. Is this filler too thick for my gun? How many coats will I have to spray? Do I primer afterwards?

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Old 05-14-2011, 04:09 PM
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I hope you dont think you are going to fill those "foot prints" with the polyester? You need to work the dents out as good as you possibly can then use a high quality filler first. The polyester primer will shoot out of a 1.8 BUT it is slow going. You can reduce it with acetone @ 10%. I would go buy a cheap 2.0 tip gravity feed. You can pick one up for less than $50.
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Old 05-14-2011, 05:00 PM
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Bondo heaven

I've filled all the indentations just to see what I'm dealing with. I sanded with 80 grit w/long block. I filled the shiny dents,but as I keep looking at my feather edges. There seems to be flat spots. I mark them with a marker, fill again and feather edge to the point where I can see thru the filler to my marks. So, no I do not have craters to fill, just odd dents that are not made from just hail.
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Old 05-14-2011, 05:22 PM
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leave the primer to one side my friend, primer is really only used for sealing the different layers of bondo, metal and paint, and to fill repair scores 120/180 grit.

to fill the minor dents skim the hole area with a fine filler, such as dolphin glaze or fantastic, these are finishing filler, easier to rub and feather out and will reduce drag marks and pin holes.
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Old 05-14-2011, 05:40 PM
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Primer for last

Oldskool, I will be spraying a Polyester Filler over some bondo patches over a wide area on the roof. Maybe the whole roof should get a coat of this type of filler? I just purchased over the internet a Gravity feed 2.3 mm HVLP filler gun. How many coats do I need? I understand thru some of the posts here, this Poly filler is hard as a brick. I will sand using my orbital sander w/320 grit. After I'll prime the whole car. The Dolphin glaze seems tricky. I can time my mix on bondo. If I were to work an area the size of a roof. I wouldn't know mix time vs application time and how big of an area to commit to. This is why I like the idea of this Poly filler. Do you agree?
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Old 05-14-2011, 05:55 PM
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the polyester needs 3 good coats apparently, but i have never used it. depending on location of dents on roof i would just skim the whole roof just mix plenty and use less hardener than normal, apply with a large applicator and make sure its a thin coat. if it goes off before you get it all applied dont panic just mix more and skim exsisting area.
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Old 05-14-2011, 06:00 PM
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If you see shiny metal or primer in a circular or semi-circular pattern, especially after sanding to feather edges, you have highs which means you have stretched metal. You have two choices, either beat them down (never a recommendation ) or shrink the metal after you have raised the worst of the ding to near level. You can pour on the filler or poly primer (which is just a spray-able filler) - but they will not "cure" the problem without excessive buildup. There is probably nothing worse then trying to fix hail dents, especially if they overlap.
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