Re: Copying a control knob by moulding
I'll give it a go and report back. It's meant for sealing the sump and various other seals in Renault C and F series engines. I'm not sure how long it'll take to set at room temperature though, as it generally cures quickly when you start running the engine.
I've also got some Threebond 1215 which is similar and actually a lot nicer to use than the Rhodorseal, which is sticky beyond belief until it sets and gets everywhere. That's a Subaru recommended sealant for the same purposes.
Both are very thick and viscous, as they're designed to be squashed by the two things you're sealing. So I would imagine the best way to take a mould of a knob would be to over fill a cylindrical mould and squash it into the gaps with a plunger of some sort to ensure it gets into all the crevices.
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