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Old 10-22-08, 07:04PM   #1
Zedo
prodigal son
 
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Join Date: Apr 2006
Location: USA
Posts: 3,978
Default best undercoats for paint job-self etch/epoxy, urethane 2K, polyester, or DTM epoxy?

paint technology is really moving ahead quickly, like everything else- a few years back the tried & true undercoat system for bare metal was 2K self etching zinc primer (the green/yellow stuff, zinc base with acid reducer/activator), followed by 2K epoxy (paint and catalyst that hardens, that can be thinned 10% to make it flow like a sealer), followed by a primer surfacer to fill any sand scratches, then BC/CC or single state color

then urethane primers started being sold that could go right over bare metal, and also had somewhat good filling properties for bodywork/filler sandscratches, but had to be built up in 2-3 or more coats

now, they have polyester spray fillers that fill .010"-.012" sand scratches, and have the self etch built right into them- and use a hardener catalyst- this stuff sounds really amazing- you can sandblast an entire panel or car to bare metal, spray it with this stuff, it fills in all the imperfections- sand it, and put your base color or single stage paint right on the primer- done

.012" filling capability means, it will fill in 36/40 grit sandscratches- that means you can air board the seams on a quarter panel patch, then spray it with the poly, and then 220-400 it out and paint it- that saves a LOT of sanding time, and recoating

basically it's a one shot undercoat the etches, seals, and fills the surface- eliminating the need for self etch/epoxy/primer surfacer steps- it's "all in one"


one brand is actually called "ALL-YOU-NEED" and made by Claussen's- this stuff is pricey over $100/gallon w/activator- but I'm told it will fill in one pass, what other primer/surfacers take 3 passes to do

http://www.smartshoppersinc.com/auto...ausenHelp.html



another brand is the well known Feather Fill brand, and it's called "Slick Sand"

http://www.evercoat.com/productDetail.aspx?pID=28



Now I'm also hearing about DTM or "direct to metal" epoxy primers that are hybrids that build/fill more than old epoxies do- yet another product that will go from bare metal to paint and fill all in one shot

question- has anyone used these new high-build, high-tech all-in-one polyester primers, if so how did they work out ?
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