Hi guys, I'm new here and this is my first post. We are using resing for a couple of years now, but now an issue came across we have never met before. We use Smooth-On silicone molds (moldmax) and Smooth-On resin as well (smootcast 305 or 321). Normally we can do around 45 casts with one mold. The problem is, the difference between the first piece of cast and the last is 1mm in size, which is a lot on a 100mm long piece. I realised this on the last 10 casts. It doesn't metter if it will be a two side mold or a cutted one. I asked the distributor if they have any idea, but they are cluess. Someone told me, the release agent could affect the size of the silicone molds, but we excluded it as some of the molds have never seen release agent...
Most of the faulty pieces has kind of rough surface as well, they are full with little dimples (you can see on the picture), but the mold itsef is nice and smooth.
Maybe some of you have met with this issuse before...
Any thoughts or advices are much appreciated!
Thanks
Adam
The good one
The bad one
The rough surface on the right