plating, anodizing, & finishing Q&As since 1989
Help, paint adhesion problem on HDPE
Q. Have HDPE water tanks that I want to convert to fuel storage. Need to paint them to reduce algae growth and gelling in the diesel side and improve stability in the gasoline side. I think the diesel side black and the gas side white? I don't know. Can't seem to find a paint that will stick.William Hanvey
- Cocolalla Idaho
August 20, 2022
Closely related historical posts, oldest first ...2004
Q. I am blow molding a HDPE product. I am trying to get paint to stick to the hdpe. I realize that pe is not the best plastic for painting. However, I'm locked in to this material. I am flame treating the material and it works pretty well. However, I want better paint adhesion. SO my question is, How can I increase the surface tension to assure a better paint adhesion? Any ideas would be greatly appreciated.Joe Nix
Manufacturing - Tulsa, Oklahoma
? Is there a reason why you cannot use HDPE that is pre-colored with a suitable concentrate?Toby Padfield
Automotive module supplier - Michigan
A. Hello Joe,
Corona discharge in a vacuum chamber will work. Very high start-up costs though. Plasma removes a few angstroms from the surface giving the paint something to "bite" on.
electroplater - Galva, Illinois
A. Hi Joe
What Toby said is very sensible ... but then you, like myriads of others, never give full info.
One idea is to use, if available, a 'waxed' paint product. We used to mark Pe containers with wax crayons (showing liquid/gallonage levels) and then HEAT those markings ... and as Pe is a long chain wax olefin, ah, those markings would become indelibly fused in place.
Anyhow, food for thought....and yes, PE like PP, unless specially treated (expensive !) won't allow for a good painted surface as you have found out!
If, if, if your final product was, say, for the sake of argument, a round section, then use a good paint with a high shrinking factor (eg. 2 component urethane) and lo and behold, it would 'lock' itself in place.
Food for thought, anyhow.
Freeman Newton [dec]
(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).
December 9, 2011
A. Hey, Joe
Apply Primer and then PU paint. PU paint can be Air dried.. or you can pass thru 50 degree temp. This is advisable for small production
- Mumbai, India
August 13, 2020
A. D-I-Y HDPE Primer:
Outside or with protective mask, melt semi-transparent glue sticks in lacquer thinner over electric burner, stirring continually. If too thick, add more lacquer thinner. Will congeal as it cools, so you must warm it before application.
- Payson, Arizona