I would like to thank my buddy Dave for first showing this to me and taking the photos.
There is all sorts of ways to make handholds from wood to bondo to silicone with fiberglass resin and while they all work none of them work well without lots of time lotss of practice and a ton of money spent in materials getting that practice time in.
The Bondo Fiberglass resin + sand yields the best results and is real close to commercial climbing holds you would buy in texture and feel. Silicone holds are extremely expensive to make, it will run you about $5+ to make a mold and then take a few hours to make then cover in silicone. To add insult to injury it will take a few days to dry and at that point you are ready to take a sledge hammer to the work you all ready did and head to the local climbing shop to buy holds.
Don't let my frustration as well as others fool you there is light at the end of the tunnel. What im about to show you is probably the easiest way to duplicate commercial holds or making your own free form holds without a "prototype".