03-31-2017, 07:56 AM
Alumilite is good, the regular RTV is fairly stiff. the HS2 or HS3 RTV is a lot softer and good for castings with undercuts.
Micromark products are repackaged Smooth-On resins and RTV. If you like them and want other options, check out Smooth-On.
I have also used Hobby Silicones products, both resins and RTV, and would also recommend them.
The key things for the resins are set and cure time. I do fairly complex castings to make carbody shells, so I like a resin with a 3 min + working time.
The key thing for RTV is how stiff it is, the "Shore" number. I prefer softer RTV's for complex castings, flat molds can often use a stiffer RTV. Softer RTV's need a mold box to make sure they retain their shape.
Micromark products are repackaged Smooth-On resins and RTV. If you like them and want other options, check out Smooth-On.
I have also used Hobby Silicones products, both resins and RTV, and would also recommend them.
The key things for the resins are set and cure time. I do fairly complex castings to make carbody shells, so I like a resin with a 3 min + working time.
The key thing for RTV is how stiff it is, the "Shore" number. I prefer softer RTV's for complex castings, flat molds can often use a stiffer RTV. Softer RTV's need a mold box to make sure they retain their shape.