joedodge, if you are talking about the "chameleon ears" lab molds hurting and you've had them less than 60 days tell the guy that did your molds and he should be able to get EAR to adjust them. They shouldn't make your ears ache to the point you quit wearing them.
To answer your question about life on the instamolds....they will last a very long time (10 yrs??) if kept clean. If they do quit fitting, like Ronnie J mentioned, you can find someone who is making them and ask to have them re-dipped in the sealer. This will restore their smooth finish and add some size to restore the fit also .