: It would be worth a try. However, I suspect that the wd40 would not
: penetrate past the outer edge of the piston, which would leave
: the 5200 between the piston and the cartridge wall to set up and
: lock the piston. OTOH if wd40 is really, really good at
: repelling water, perhaps it would actually prevent vapor from
: getting in there, in which case it might prevent the piston from
: seizing.

: Best regards, Allan Edie

WD-40 is a water-displacing spray originally designed to repel water and prevent corrosion; WD-40 stands for "Water Displacement – 40th Attempt" according to Wikipedia. Don't see why it wouldn't work if the piston to cartridge line was completedly covered.