Wednesday, 23 December 2020

Here Come Demould - Of The Castings

"And will you succeed?
Yes! You will, indeed!
(98 and ¾ percent guaranteed)"
- Dr Seuss

So, the mould having sufficiently cured, I used it to make a polyurethane cast. That part of the process wasn't as fraught as I thought it might be. Whilst there is a limited time to mix and pour the combined chemicals - around two minutes - that's actually plenty, and although the chemical reaction is exothermic, nothing got overly hot. The results are most acceptable.

Here's a comparison with the original model:

Production is fairly quick:

Paradoxically, the fact that it has all worked first time has rather disconcerted me. In my mind I was going to have several attempts at getting the mould right and then a few goes at casting before eventually patting myself on the back for having mastered a new craft. Instead I am pondering what to make with this new not-very-skilful skill, not to mention several hundred grammes of resin. In the meantime I am going to do two things: paint one of the castings, and mould and cast something which is shallow compared to its width, just to see how that works.

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