Re: 7/8ths Building System
Posted: Tue Apr 02, 2019 6:57 pm
Not boring at all and very well engineered and well thought out
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I think you are being more than a little over-sensitive.The Oily Rag wrote: ↑Tue Apr 02, 2019 4:28 pm I understand my detailed explanations are using up my ration of posts.
It's many years since I last did any casting with silicone rubber moulds, I used to make two part moulds for metal casting of detail parts and open moulds for resin casting rolling stock bodies in HO scale. I used linotype metal for casting, but I would guess that is no longer obtainable. My resin experience was with polyesters (awful stuff) and epoxies (which attack the rubber). Polyurethanes were just coming into use when I stopped, but I remember them as being sensitive to moisture when casting. I used Silastic 3120 rubber for both metals and resins, as I didn't do enough casting to keep two types on the shelf. The stuff was too expensive and had too short a shelf life for that and I did more metal casting than resin casting.
One of the local metal refiners still lists it as well, but I don't think I'd live long enough to get through a 5kg ingot. There must be another use for it now, as it is still available. I've still got a few sticks of type metal left, if I take up casting again.