I cast my first two stamp pens yesterday and have learned a lot about casting in a very short time. One of the pens was coated in an acrylic lacquer before casting and the other was left uncoated. Having been caught short on my first casting a week or so ago when it started to go off in a very short time I was wary and had everything on hand for this one. I used Alumilite, the same that Alan used in his money pen yesterday which is another first and set about the task. I weighed out one part of the resin and started to pour the second part directly on top of it. Half way through pouring the scales gave up showing 'LO' for low battery..... AHHHHHHH! So I guessed how much to add. Quickly I mixed up the 2 parts, poured it into the mould and put it in the pressure pot and wacked in 4bar of pressure (the equivilent of diving to 120'). I had a bit left over and thought I'd leave it to judge when it was set but got carried away and mixed a load of shavings into it, but thats for another day.
I left it over night and when I took it out this morning it was still a bit tacky but came out of the mould easily. I stood it on the side for a while and after an hour had started to slump, it was still very fluid. I put it back in the mould and on the aga for the rest of the day despite knowing they were both now knackered and took them up to the shed to turn just to see what was inside for interests sake.
To my suprise the first one turned out perfect, this is the one that I'd coated, it was a little darker in colour but no bubbles and looked good. The second one that hadn't been treated was a lot lighter but for some reason the stamps at the ends had been dissolved.
So my lessons learned. Coat the stamps first, ensure the pot stays warm overnight and don't take out of the mould if its still tacky.
The world is now my lobster.
I left it over night and when I took it out this morning it was still a bit tacky but came out of the mould easily. I stood it on the side for a while and after an hour had started to slump, it was still very fluid. I put it back in the mould and on the aga for the rest of the day despite knowing they were both now knackered and took them up to the shed to turn just to see what was inside for interests sake.
To my suprise the first one turned out perfect, this is the one that I'd coated, it was a little darker in colour but no bubbles and looked good. The second one that hadn't been treated was a lot lighter but for some reason the stamps at the ends had been dissolved.
So my lessons learned. Coat the stamps first, ensure the pot stays warm overnight and don't take out of the mould if its still tacky.
The world is now my lobster.