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Old 08-26-2007, 02:31 AM
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primer over bondo

when you spray epoxy over filler is it always suppose to look duller than the other areas?

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Old 08-26-2007, 07:16 AM
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Itll always have a different look to it til you get a couple of coats on it.
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Old 08-26-2007, 07:33 AM
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I always put my epoxy on the metal first,Then i do the body work,Then put high build primer.then block it out.
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Old 08-26-2007, 07:45 AM
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Quote:
Originally Posted by 68442
when you spray epoxy over filler is it always suppose to look duller than the other areas?
Yup, your filler will absorb some of the epoxy since it is porus, after a few coats when it isn't absorbing any more material it will then look the same.
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Old 08-26-2007, 10:19 AM
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Quote:
Originally Posted by baddbob
Yup, your filler will absorb some of the epoxy since it is porus, after a few coats when it isn't absorbing any more material it will then look the same.
Quite correct and a perfect example of why it's advisable to spray epoxy over the bare metal first. The filler is porous and from the time its put on will absorb moisture from the air. This moisture eventually will find its way through to the bare metal underneath and will cause rust. By protecting the bare metal with epoxy primer first it will keep the metal from rusting below the filler and over time causing problems. It's not absolutely necessary to do this but advisable none the less.
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Old 08-26-2007, 10:32 AM
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I tried putting a lot of coats,In no matter how many coats you put you will still see where you put bondo.At different Angles you will see it.plus you don't want 20 coats of expoxy.
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Old 08-26-2007, 03:25 PM
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It may depend on what epoxy you use. I don't have a problem with it showing up after a couple of coats. It also may depend on how you sand it before applying the epoxy. The only reason that the high build would make it appear to disappear faster is because of the film build. I would rather have that much build from a quality epoxy than from a HB 2K.

Aaron
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Old 08-27-2007, 07:53 AM
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put med coats on and let it fully dry to the touch before the next coat and you will get better hiding and save material. Personally I wouldn't use epoxy over filler, I use sufacer instead.
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Old 08-27-2007, 08:42 AM
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On my '35, I have only used Epoxy-under and over. as far as seeing Bondo, I sprayed last weekend and you cannot tell where the Bondo is (using SPI)-I am not using 2K, I am building (what little build I need) with Epoxy-

Look at this Thread-pay attention to what BarryK says:


Epoxy Primer a a Filler?
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Old 09-15-2007, 02:39 PM
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Epoxy Primers are a dual purpose primer for direct to metal applications or as a Primer Sealer before your base coat. They are not intended to be used as a Primer Surfacer over filler, they do not have the filling property's of a primer surfacer, 2k's or high build polyester primers. You may actually have a serious problem with shrinking down the road due to using it for high buildup applications. I work in a professional street rod shop and personally recommend a high build polyester primer over body work and metal, we use Slick Sand by Evercoat. It has ZERO shrinkage, unlike even the best 2k primers out there. It actually uses a liquid activator like you use in all metal and dry's using not just chemical reaction like 2k's but also heat. If you feel the back side of the panel it will actually feel warm. The reason this is good is that it helps pull the primer INTO the sand scratches and pin holes not just covering them up, eliminating shrinking later after you have spent thousands on a paint job only to have sand scratches start showing after some time in the hot summer sun. We have actually had problems with filler not wanting to adhere to the expoxy primer with proper prepping and have since quit using it all together. If you have ever seen American Hot Rod on tv the next time their skimming a car notice it is to ground bare metal, not expoxy. Personally I don't recommend an expoxy for any use, especially over filler. Its kind of a jack of all trades but master of none, with our shop working on healthy six figure cars, thats just not good enough. Sorry if this got lenghty and can hopefully help.
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Old 11-05-2010, 09:19 PM
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Evercoat question

What about evercoat slick sand over bare aluminum, then slight body work and then a second coat of slick sand?
cleland
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Old 11-06-2010, 10:25 AM
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This thread is 3 years old!!
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