EverHopeful wrote:
Good question. I've only had the stuff a couple of weeks, so it's going to take a while to find out. First impressions are that it seems quite tough. I experimented with mixing in some sawdust to make it a bit stiffer, so I ended up with several balls of the stuff with various mixes. I cut those in half which was surprisingly difficult and have used them around the workshop for resting blocks of wood on so they don't slip. None of them seem to have worn in any way. The stuff attached to guns still looks like new. I think I have it on three of them now.
One thing I didn't mention is that while sugru sticks like crazy, this casting putty is deliberately made not to be sticky. It seems to have some sort of oily release agent mixed in. Sometimes it seems to stick anyway (I think the sawdust helps here, perhaps it absorbs the release agent), but in other cases I've had to glue the grip in place after it sets. Fortunately the stuff seems to stick well to itself, so you can build the grip up in several stages to get the perfect fit, and if the grip completely encloses what's underneath it will tend to hold well.
Jim
As with most products of this nature there are a few things to keep in mind. Mixing in thickeners of a powder nature will reduce the cured products overall strength. Powders like talc and wood flour are used to turn liquid products into a non-sagging, paint-on product to be applied to vertical surfaces. If you want to add bulk to your mix and increase strength, go with a fibre. There are milled plastic strands and cut fibreglass strands, usually about 1/4" in length. Sanding fibre fortified materials will expose the fibres, in which case, you would apply a finishing, top coat. This coat should be thin and brushed/sprayed on to give a shiny, finished look.