Last few credit cards I got in the mail were stuck to the cover letter with a dab of rubber "snot". I removed it from the paper and the back of the credit card and used the "snot ball" under the grips of my 1918 Arty...whose right grip was always a bit loose.
This stuff never seems to harden and can be easily removed with a little rubbing with a finger...
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />