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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Spraying Yellow Zinc Chromate
Q. Hello:
I wish to spray Yellow Zinc Chromate using a siphon feed gun.
My questions are:
1 - What is the thinner for Yellow zinc chromate?
2 - What Zahn Cup viscosity should be used?
3 - What is the cleanup material (thinner)?
Thank you,
Barry M. Schulte- Linden, New Jersey
2002
A. Hi Barry,
You do not give enough information to be able to help you.
1. Which specification paint are you planning to use (I suspect it will be MIL-PRF-23377
[on DLA] or MIL-PRF-85582
[from DLA]
)? Note that there are QPL's with both of these specs so you will be limited to which products you may use.
2. Without knowing which spec or which product you use it is impossible to tell you what your expected viscosity range will be.
3. The best clean-up I have seen involves the use of a near-zero emissions recycled solvent gun cleaner. Again it will depend on which product you are using.
The best advice you will find will be from the manufacturers of the paint that you eventually buy from; they should be the experts!
Brian Terryhelicopters - Yeovil, Somerset, England
A. Hi Barry, some years back, your zinc chromate was phased out, I used it in the military. It is replaced with zinc phosphate which is the yellow stuff. The zinc chromate was green. These are the best primers I know of. EPA phased out zinc chromate. I thinned it with enamel thinner. It is very sticky stuff. Just thin to sprayable consistency. This stuff won't chip off the metal from rocks hitting it.
Jim Payne- Grayling, Michigan
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