I offer a product called Pros-Aide through my special effects company, Nimba Creations.com It is an adhesive of unparalleled strength specially designed to be used on skin. It is non-toxic, water based when wet, water-PROOF when dry and sticks like HELL!
This adhesive is one of the best I have ever used to glue playing cards when making gaffs! It is micro-thin and flexible!
You can also use this product to perform impossible lifts or hold-outs on your own body!
It isn't cheap…I'll warn you now, but it is OUTSTANDING stuff and there is nothing like it out there. It is sold in 50ml bottles and has full application, use and removal documentation. One bottle will last for dozens and dozens of gaffs
Here's the web address to get it from
http://www.nimbacreations.co.uk/acatalo ... plies.html