I employ the help of fellow racers who have had the same issue. I am not sure why this coating is flaking off but I want to coat with something to stop it. I will be using for drag racing so heat will not be an issue. I was thinking of fingernail polish but open to any suggestions or remedies that have been successful in the past. Thanks in advance for your help and consideration of this dilemma.
Parma resistor coating flaking off
Started by
chasbeeman
, Apr 24 2022 10:12 AM
6 replies to this topic
#1
chasbeeman
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Posted 24 April 2022 - 10:12 AM
Charles Beeman
#2
Dave Crevie
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Posted 24 April 2022 - 11:50 AM
Bob Smith 5-minute epoxy. This is not a new problem, we've been dealing with it for decades. The epoxy just keeps the windings in place, so don't load the resistor up with it. And definitely don't get it on the area that is wiped by the trigger contact.
- Rotorranch likes this
#3
Bill from NH
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Posted 24 April 2022 - 01:00 PM
Parma sold bottles of that ceramic coating suspended in a paste-like liquid. Epoxy is a better alternative.
Bill Fernald
I intend to live forever! So far, so good.
I intend to live forever! So far, so good.
#4
Jay Guard
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Posted 24 April 2022 - 02:23 PM
Probably the most technically correct coating would be Glyptal but it is pretty expensive. An alternative coating which appears to be basically the same thing is Gc Electronics 10-9002-A Coating Red Insulating Varnish 2 Oz$10.52ZoroFor most items:30-day return policy . It's only about ten dollars and would probably coat at least 10 or 20 Parma resistors, and as Dave said don't get any on the wiper surface. I don't know how thick this stuff is but you want a thin coating to not insulate the windings too much so you may want to thin it down a bit.
Jay Guard
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#5
MSwiss
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Posted 24 April 2022 - 02:51 PM
I'm not sure why it does it, but I periodically have to clean my controller holder boxes, on my driver's panel,from pink dust and flakes.
Also, if I wind up with a box in a buyout of somebody's old stuff, it inevitably has a drawer coated in pink dust.
Mike Swiss
Inventor of the Low CG guide flag 4/20/18
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#6
Mr. M
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Posted 24 April 2022 - 04:25 PM
The later resistors had a grey epoxy that never flaked.
Chris McCarty
#7
Bill Seitz
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Posted 24 April 2022 - 05:46 PM
I've "improved" the flaky orange or pink coating with an overcoat of JB Weld or other epoxy. The resistors with the gray epoxy are the slightly more expensive wet wound version which I prefer. I've had the gray epoxy flake off the wide band areas, but there's a much lower occurrence than the orange, blue, or pink coatings on the standard resistors.
