this was my first homemade stp:
-now for instructions-
first make a paper stp using index cards and scotch tape make sure you laminate the inside with scotch tape before assembling it.
below are the pictures of my pieces and it assembled.
you should test your stp once to see if it works with your anatomy before you take the time to coat it with silicone.
the silicone stp making part.
-laminate paper stp
-clear silicone caulk
-caulk gun or random tube shaped object
-culinary scissors or knife
-long thin pointy object
-pam or WD-40
cut the tip off of the tube with scissors or a knife and poke the seal out with your long pointy object
spray your paper stp with WD-40
squeeze out some silicone
scrape it off with the popsicle stick and put it on the paper stp now repeat this last step 100 times allowing one side to dry to a rubbers consistency before adding more silicone
when all sides are at an adequate thickness peel the paper and tape from the inner walls of the stp. you may find that there are thin spots in your stp you can go over these with another coat of silicone once it is dry to the point that it no longer feels tacky or smells you can use it.
hope this helped all FTMs who are willing to DIY. please post pictures of STPs you make, and ask any questions you may have about the process.