Get the one with the bigger cup (at least 20 oz). I used the siphon feed from HF with the small 8 oz cup. It is way to small. I would have to stop too often to refill. From the other posts, it looks like the larger volume it is cheaper anyway.
If I did it again I'd definitely go gravity feed--I think I'd get a more uniform spray.
I'm using Variprime 615/616 and my siphon cup is lined with plastic. No problems whatsover with the primer attacking the plastic.
Good luck.
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto
Donation reminder: Jan. 2021
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