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Thinner needed for epoxy primer?

TJ in KY

TJ in KY

Member
I will be using PPG MP 170 epoxy primer and the tech sheet says under mixing instructions that acetone can be used for an additive up to 10%.
When is an additive needed, is acetone used to thin the paint?
This is my first time using epoxy primer just want to be sure i have what i need and when to use the acetone, if needed,
Thanks for your patience, i know i have asked a lot of questions but just want to have a successful outcome.
Tom
 
It does not need acetone. It will flow out a little better with the acetone, but on cast you won't see the difference. You will usually put sandable surfacer over it on the sheet metal for a smooth finish. Some people like to put a final coat of epoxy over the surfacer, for perhaps a little "firmer" or more chip free surface. I think I did that once. I have used it without acetone on things like battery boxes with no problem. You really only need it if you do not want to use surfacer on sheet metal. So the short answer is no.
 
I would just use PPG's thinner for their primer.
You may want to add hardener. You need to use a supplied air system. Hal
 
MP 170 does not have a thinner, except for the acetone if you think you need it (usually not). The catalyst for MP 170 does not contain Iso's.
 
Use a little thinner only if the primer is not laying smooth or barely coming out of the spray gun. For reducing paint use what the paint's fact sheet says.
 
No, No, and No. Did you use epoxy primer on that garden tractor we see so much? And a spray gun or rattle cans? Epoxy is sold with a catalyst, no hardener should be added. There are no isos in it.
Why would you use something OTHER than what the spec sheet calls for for thinning?
 
There was nothing added to the epoxy primer other than thinner. I sprayed Dupont's surfacer
over the primer. I used Dupont's Centari acrylic over the light cream and new Holland's acrylic enamel blue. Used an old Devilbiss spray gun. Hal
a42291.jpg
 
Thanks for all replies, I will be starting with mostly cast parts so I don't think I will need the acetone. I may pick some up, probably good to have on hand just in case of problem with gun.
 
El Toro -- I don't know the type of "epoxy" you used, but true epoxy is two-part, primer + catalyst, it won't cure properly without the catalyst. Some companies use the term "epoxy" loosely but it really isn't. PPG and Dupont epoxy really are epoxy's.
 
Maybe not, but if it is epoxy it probably is not bonded as well either to the metal underneath or the surfacer or topcoat. With a typical chip, the epoxy will not be disturbed. Without the catalyst the chip may go to bare metal, meaning rust. In other words you are losing the benefit of the epoxy.
 
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