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Old 06-27-2011, 10:24 AM
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Poly Filler vs Poly Primer

I not having much luck skimming panels with Polyester filler for blocking purposes and was wondering would would be the difference between shooting some Poly Primer to fill the low spots and Skimming with Poly Filler.
Is the quality of the filler vary? Will the Poly primer shrink while the Poly filler doesnt?
Any suggestions?
I dont mind having to mask areas and clean guns to shoot the primer. would much rather do that than have filler dry up on my in between or applying too much and having so sand my a.. off.

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Old 06-27-2011, 11:36 AM
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Fillers vary in quality and it takes a bit of experience to get a mix with a decent cure rate to allow a good spread. One is to try a filler like Marson Platinum that spreads thinner and easier and not cat it hot so you have a bit more time to spread the filler.

Look up the basics of basics series and go to the one on filler to get some more tips..

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Old 06-27-2011, 11:53 AM
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If the low spots are really minor and it's after using filler, then you can use a product called Icing or Evercoat's Metal Glaze

I've used both and for the same reason - they are both good products

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Old 06-27-2011, 04:26 PM
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The metal glaze is VERY soupy,I like the ez sand a little thicker and easier to handle ,also made by evercoat.The poly putties DO take some getting used too.If your doing big panels you need to go from one end to the other in one pass and you wont get much done (maybe three passesat most) before it starts drying. I scrape the edge with a steel putty knife before I continue on.it might take 5-6 mixes to completely cover a roof,what I like about the putty is when you fininsh getting it on you can start sanding right away,with primers theres masking ,spraying and waiting involved....
A lot of guys like the new feather fill primer..it might be easier for you to sand if you dont mind the extra work...and time involved...
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Old 06-27-2011, 07:41 PM
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Im using Evercoat metalworks Zgrip. Is there any more products out there that are easier to spread and sand?
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Old 06-27-2011, 09:19 PM
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"Metal Glaze" will blow away that Z grip in ease of use.

The biggest problem with the polyester putties is that they kick too soon when you are trying to spread it out on a large panel. It takes a little time to learn how to pull it off.

Polyester primer is way easier, but will it fill what you have, THAT is the question. It will fill like a mad man, you could literally tape a dime to the panel and bury it in polyester primer. But if you ask it to do too much you will be in the same boat you are with the "regular" filler.

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Old 06-28-2011, 07:56 AM
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In certain situations you might also consider skimming with urethane primer. I am currently shooting my ski boat and in the process of prepping I discovered that the original mfr had done a really poor job with the factory paint and clear. It is filled (and I mean filled) with tiny pock holes. So after sanding the boat down I shot it with a coulpe coats of urethane primer, sanded to 320 and then used urethane primer as a "skim coat" to fill any remaining pock holes/pin holes.

I also used polyester primer to do the final skim coating on my sedan delivery...I just didn't have any polyester around for the boat, so I used the urethane and it works about as well although obviously more soupy.

One minor suggestion. For both polyester and urethane skimming, I use a cut up old credit card as my applicator. Seems to have just the right flex to decently spread the material.
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Old 06-28-2011, 08:07 AM
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Quote:
Originally Posted by cboy


One minor suggestion. For both polyester and urethane skimming, I use a cut up old credit card as my applicator. Seems to have just the right flex to decently spread the material.
Those work well as do the key cards that most hotels and motels use now. I seem to collect lots of those key cards in my travels and they are for me much better then most of the plastic applicators for small areas - and are "free" with every new hotel stay

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Old 06-28-2011, 09:53 AM
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I am doing the final 'skimming' with high build Eurethane primer to cover the final pinholes and prep for sealer.
What Im trying to accomplish here is to fill some low spots but when attempted to fill with Poly puddy I ended wasting hours sanding it down.
I just purchased a quart of Evercoat sprayable featherfill. Im gonna give it a shot on a fender and see how it works.
I was just wondering if there where any bad effects of using this sprayable filler versus using the puddy?
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Old 06-28-2011, 05:28 PM
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You'll need a big tip to get it out of your gun
be very careful getting the mix ratio right
it needs something rough to bite into , 80 grit
It chips easier so keep it away from the edges so you dont get a buildup
I would dry sand it ,it had a reputation of being porous and absorbing water if wet sanded
Other than that it has some pretty amazing building properties,I'd long block it with 80 to start and work it up to 180 and lots of guide coats ....and some icy hot for the end of the day...
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Old 06-28-2011, 05:43 PM
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Its a lot of work ...here some pics of a rough one , so you dont feel so bad.
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Old 06-28-2011, 07:29 PM
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Thanks for the info and the pics.. This really helps and give me some confidence that Im at least on reasonable track. I better start with investing in some icy hot.
Im learning that its about the same time and work if i at least skim the entire panel or roof than do do parts and then realize I missed some low spots and have to mix again and reapply to those low spots


Thank you for the info
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Old 06-29-2011, 06:09 AM
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there will never be any shortage of sanding in this line of work.
One thing I've learned is there are many paths to get to a certain point .if you dont take them all you wont know best way to go..for instance a man with strong legs might take a hillier path because its shorter.Theres no "one way" to do this work....Just because I prefer ez sand over feather fill dosent necasarily mean my way is better ,just better for me. I'm cheap ,so I dont buy anything I dont HAVE to..I'm impatent ,so I want it done quick and hate waiting for things to dry. Not to mention lazy and easily distracted so Im always looking for products that take half the labor and are twice as fast that'll last forever...
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