Spirit Gum is a brush on liquid adhesive used for attaching prosthetics, and other special effects to the body without harming the skin or the prosthetic. However, stores only carry it around Halloween here. Is there an alternative to it that I could use, that won't damage me or or the special effects, that I could pick up at a crafting store like Hobby Lobby or even a place like Walmart?
Its been a while and I found my own answer.
As an alternative to spirit gum I've found that name brand Eyelash Glue (glue intended for use attaching fake eyelashes) works as an alternative, though the cheap stuff does not. The cheaper Eyelash Glues does't hold up well and the prosthetic is easily pulled off with the most minimal of force, making it a bad choice if one intends on wearing the prosthetic anywhere that there is a chance it will be brushing up against anything (like walls, tree branches, etc.)
The best alternative I've found is Nail Glue (Glue intended for attaching fake nails). The nail glue is relatively cheap. It holds as well as spirit gum but it is also just as easy to remove the prosthetic once you're done as it is when using spirit gum. It does not appear to have damaged the prosthetic either.
Both Eyelash Glue and Nail Glue are readily available where ever make up is sold, including Walmart, Target, CVS and Walgreens.
This article from Popular Mechanics suggests using corn syrup thickened with flour. I found it while looking for a recipe to make spirit gum, which should be possible using rubbing alcohol and rosin (the latter is available from music shops as violinists use it). But I failed to find the proportions.
Other sources suggest an adhesive intended for false lashes.