Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Primer for liquid metal top coat
May 29, 2020
TUTORIAL FOR NEWBIES:
Verometal is a "cold liquid metal coating" of the general same sort as Liqmet, Luminore, Metal Facades, Metalier (and probably others). We neither claim that these products are equivalent nor that any particular one is better or worse -- just that the general technology consists of mixing a high ratio of real metal powder with a relatively small amount of binders, that they become largely metal after curing, and that they can be applied as a spray coating from as thin as perhaps 120 micron thick (about 6 times as thick as high quality nickel-chrome plating) on up through virtually any trowel-able thickness.
We discuss technology in this forum, not brands or sources (why?), and any advertising is clearly labeled as such. None of these suppliers has (so far) elected to directly advertise here (although some might occasionally via Google Adsense ads, and we cannot favor any via links or in postings.
Q. Hello ALL,
My name is Piotr and I'm looking for the best primer for a unique coating system.
Substrate - aluminium
Pre Treatment - I have a few different options:
- chrome free dipping system
- hexavalent chromium dipping system
- sand blasting
combination of both (mechanical + chemical pre treatment)
Top Coat - wet spray Verometal bronze.
This is for external exposure.
I can apply both powder or wet spray primer but obviously it must have good bonding properties.
Thanks in advance
- Warsaw, Poland
A. Hi Piotr. Verometal claims that the coating can be applied to almost any substrate after proper treatment, and I think people should ask the supplier of the brand they use what the proper treatment should be for aluminum.
But as a general rule, "hexavalent chromium dipping system" (which we might call "chem film" or "chromate conversion coating" in the USA) is the most generally accepted and robust pretreatment for aluminum. But it may not comply with RoHS, REACH, and other European standards, in which case a good alternative is probably the trivalent chromium conversion systems described in MIL-DTL-5541
[on DLA]. Good luck!
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 2020
A. Hi, I train people to use [brand name removed by editor] liquid metal coatings and have used Vero. You should use a 2k epoxy primer.
Kathy BBInstructor for [brand name removed by editor] coatings - Duluth Minnesota
October 25, 2021
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