was going to recommend the at home method of making the stuff! I used it to repair some t-top weather stripping, you can mix more/less cornstarch depending on how hard you want it to be in the end. Also was thinking about making a custom grip out of the stuff so my
mod would be made for my hand specifically. Would never think about heating the stuff.
You can also get different color ink to dye the SIlicone (mix dye with silicone the clear stuff to get colors)
side note, also used this stuff to make a few pairs of custom in-ear headphones and worked like a charm, really molds to your own shape and after about 30 mins is hard enough to remove without loosing shape