So, having sought advice from the collected wisdom of the chaps over on the LAF, I tried again. The suggestion seemed to be that Blu-Stuff wasn't the way to go, and the liquid green stuff wasn't ideal either. So, scratch everything I'd previously done! After a bit of a search, I managed to dig out my instant mould and green stuff (it had been tidied away after my young lady had requested that there be a flat surface available somewhere) and set to making a new mould:
Preparing my instant mould the usual way, results in a mould that looks a little like the world's most unappealing Turkish Delight:
However, it looks a lot better on the other side:
But then again, so did my Blu-Stuff moulds... Lubricating the mould with vaseline, I mixed up a small batch of green stuff and had at it - the green stuff is a bit old, and a bit tough, but nevertheless I'd soon churned out these:
A little thicker than I'd hoped, but still not a bad result for a few minutes work! Overall, it seems like using proper green stuff rather than the liquid variety has made all the difference, as I can churn out a few in very little time at all. Fingers crossed I can trim these down once they're dry and glue them onto the receiving shields, but that's a job for another day... In the mean time, I might have a go at doing a thinner scraping of green stuff, and trying to stick it straight onto the receiving shield while still wet...