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Look for Ultra Slick...white tube, black lid, black writing, orange label. It's a clear gel like lubricant (looks like clear vaseline-ish sort of)...it contains PTFE in suspension.
It's good for EVERYTHING. Greasing moving parts...lubing orings...greasing gears...etc...
You actually want a nice tight air-seal fit between the piston head oring and the cylinder wall.
You're going to ask about compression testing next....but that's enough spoon feeding...go do some searching for "compression test", "how to check compression", etc...
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