Tamco HP770 Epoxy questions

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PostPosted: Tue Feb 13, 2024 9:45 am
NO COMPARISON.... Omni is 56.4% solids while Tamco is over 78% solids. The Omni is not a "build epoxy" product. That Tamco epoxy actually takes the place of both an epoxy and a 2k high build.
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PostPosted: Tue Feb 13, 2024 12:47 pm
DarrelK wrote:NO COMPARISON.... Omni is 56.4% solids while Tamco is over 78% solids. The Omni is not a "build epoxy" product. That Tamco epoxy actually takes the place of both an epoxy and a 2k high build.


Correcting myself Omni MP282. The product sheet says 61.8% solids.
Tamco 770 Total Solids by Volume (RTS) 78% as sprayed

Tamco is twice as much in price.



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PostPosted: Tue Feb 13, 2024 1:24 pm
DarrelK wrote:Dennis, I know what you are talking about concerning shinkage....it's one of the #1 things that restoration and conservation people working in woods have to contend with....
I'm telling you....this stuff is a game changer. The hardened puck only does a minor shrink in the first 24 hours or so and is then stable.... I have a puck from a year ago and it has not changed. Another thing with this stuff is the great sanding quality. It levels and dusts up nicely, definitely self guide coating as well. Makes the old polyester high builds look like crap.... I don't use any of the old regular or high build primers at all anymore, just this stuff. This again was a direct quote from Bob which is in the product description on their web site.... "If you want a high build, quick sanding, non shrinking epoxy. Consider the 770 series epoxy."


Forgive me if this is a "dumb" question, i'm still getting my bearings on this stuff....
- Would the HP770 be a "one size fits all" for use as both an initial direct-to metal epoxy primer, and also as a high-build primer to seal up body filler and function as a sealer before base coat?



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PostPosted: Tue Feb 13, 2024 10:24 pm
Bigbore500r wrote:
DarrelK wrote:Dennis, I know what you are talking about concerning shinkage....it's one of the #1 things that restoration and conservation people working in woods have to contend with....
I'm telling you....this stuff is a game changer. The hardened puck only does a minor shrink in the first 24 hours or so and is then stable.... I have a puck from a year ago and it has not changed. Another thing with this stuff is the great sanding quality. It levels and dusts up nicely, definitely self guide coating as well. Makes the old polyester high builds look like crap.... I don't use any of the old regular or high build primers at all anymore, just this stuff. This again was a direct quote from Bob which is in the product description on their web site.... "If you want a high build, quick sanding, non shrinking epoxy. Consider the 770 series epoxy."


Forgive me if this is a "dumb" question, i'm still getting my bearings on this stuff....
- Would the HP770 be a "one size fits all" for use as both an initial direct-to metal epoxy primer, and also as a high-build primer to seal up body filler and function as a sealer before base coat?


No question is a dumb question. Don't listen to me about paint though... I'm new to auto paint and have no clue. I'm learning as I go and I don't want to mess up my first auto paint job on a rebuild. I had to sand down a couple runs from my MP170 coat. I don't know if I'll go with Tamco HP770 or Evercoat Featherfill G2 and MP170 as my final before base. The Tamco HP770 seems to be a single application meaning it can replace what I may be going for (Evercoat Featherfill G2 and MP170) and the price may be reasonable with the Tamco HP770 application. I don't know how that would turn out but there are experienced painters on this forum with those answers.

I do know that you want a good epoxy down on metal before body filler, body filler is porous and moisture will eventually lift anything above it.

With my setup
DTM omni mp170 2k epoxy, 3 coats
evercoat featherfill g2 (filler)
omni mp170 2k epoxy, 3 coats
base
clear

Tamco HP770 Description and TDS

https://tamcopaint.com/products/high-bu ... ription_i1

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PostPosted: Tue Feb 13, 2024 10:47 pm
That Tamco product replaces all of the usual stuff from bare metal primer and up. You could 'not pay me enough money to go back to Slick Sand, Feather Fil, etc. The epoxy yields a stable, non shrinking surface that has NO recoat windows. ALL of those polyester primers will shrink and usually months after the shoot. I did all of my priming, sealing, high build with just that one Tamco epoxy product a year ago and there is NO evidence of movement or shrinking. I literally grew up with PPG series primers, paints, etc. back in the 1980s. Guys were crabbing so much about the increase costs of paints so much that PPG offered the Omni and later Shopline series. Omni basecoats is one of the poorest quality bases I have ever used.... The last time I shot an Omni straight white basecoat it took me 6 coats to get coverage.... yes, 6. To support that the following sign hangs over the desk of my PPG paint jobber.... "Absolutely no color matches or returns on Omni."
Attachments
X car cruise Aug. 2023 1.jpg
Car show late Fall. This is a 6 flop chameleon. Trust me if it was shrinking you would know it....
Week 11 f.jpg
Fresh out of paint early Spring last year.
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PostPosted: Fri Feb 16, 2024 11:01 pm
How far does a quart go? let's say a full-size truck or car.

this is 3 full coats and a 4th light coat of mp170 2k epoxy primer quart the whole can. both outer rockers and inner rockers, front of wheel well, cab corners, and floor of crew cab. could have done more than 3, but I was fooling around and my first time using an hvlp or any paint job at this level.
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PostPosted: Sat Feb 17, 2024 12:12 am
Well, that's a tough question to answer as it depends on just how you are reducing and more importantly what tip size you are using. I mean, I can push it through a 1.5 but Tamco recommends a 2.0 to 2.5. And, this is a true 1 to 1 mix of resin and hardener so you are buying 2 quarts plus the added reducer. When I build our Smyth kit trucks I just buy a 2 gallon kit which does everything in the way of sealing and high build and I still have a couple of quarts left....
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