I have this Fix-It-Yourself kit from Freetom for sale. It consists of two components that need to be mixed and applied to the prosthetic. The mixture then hardens to repair rips, tears or other types of damage. Perfect for making your prosthetic last longer instead of throwing it away. The colour is "tan" and fits lighter/caucasian prosthetics.
I have used a little bit of each component for one repair but there is plenty left of both. Instructions are included. The kit cost 74 USD with shipping (I live in Denmark) so I am thinking 40 bucks which will save you quite a bit of money if you're on this side of the pond :)
Please e-mail me at firstname.lastname@example.org if you're interested :)