MadDokMathWych wrote: - You are correct, for the first several castings the instant mold stuff, a mold release agent isn't necessary. While start up costs and learning curve can be significant, here it is cheaper mold for mold and cast for cast than the instant mold + epoxy method. In my town, there is an art school which has spawned lots of art supplies stores - some of these sell RTV silicone (not instant mold, takes half a week to make a two part mold) at prices cheaper than the internet. Honestly, I've turned away from instant mold products for the time being, partly because of the issues mentioned by the OP. Is it a brand, or a type of instant mold? Do you like it? Is it expensive? Do you get it in stores or on the internet? How many castings can you get out of a mold? If you've had success with it, I may check it out. That being said, I've never used the "oyumaru" that you mentioned. When the non-stick properties begin to wear out (after several castings), or when my piece is skinny, that is when I begin considering the Vaseline. Even if it can't be fixed, it can still be an effective bit given the right weathering techniques when painting, or used as diorama battle debris). (Though disheartening, it can often be fixed with CA glue. In regards to failed casts, I've had pieces with skinny bits (blades, staves, spikes) break off during the demolding process. Also, instant molds wear out quicker than "not instant" molds (ie 2 part RTV silicone).
However, ALL molds (instant or otherwise) have a lifespan and wear out with repeated castings, regardless if they are marketed as "reusable" or "no mold release necessary." I've observed that molds made from an original with negative space wear out quicker.
You are correct, for the first several castings the instant mold stuff, a mold release agent isn't necessary.
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