If you want to get rid of stickiness just put the prints in water while curing them!
I had amazing results with that procedure!
I just print the stuff, put it in IPA for 2 minutes, put it in a container filled with normal tap water and put it ouside (even on overcast days there is enough UV-light to nicely cure the prints within an hour).
Since I started doing this I never had any problems with sticky prints anymore!
Why in water? Because Oxygen seems to prevent the resin from activating (hardening) and thus the prints stay sticky independently of how much UV-Light we shine on the stuff! Under water, the oxygen is locked out (the oxygen content of the water does not seem to matter) and enough blue / UV-Light passes to harden the parts reliably.
Still, replaxing IPA seems a good idea!