Since I (too) ruined the PDMS through running the B9Creator with the build platform accidentally positioned too low, I shot me some Sylgard 184 on eBay USA.
Unfortunately, it travels a long time until it arrives in good old Europe.
Apparently, there must be sources and/or alternatives locally.
The first is a german distributor of Sylgard 184 (MAVOM GmbH, Steinfurt).
They can deliver Sylgard 184 within 2 days, but charge 170€ (net) for 1.1kg and request a minimum order of 300€.
European B9Creator owners could share a batch eventually.
An alternative I have sitting and curing on my desk right now came from www.silikonfabrik.de (nice online store), where a small quantity order is no problem and prices are moderate.
Looks promising! I got me 1 kg of SF-45 2K silicone rubber (500g+500g), 250ml silicone oil to adjust the viscosity eventually and a 500g/0.1g tomopol t800 electronic balance - that was 50€ all together.
The "45" in SF-45 is for the Shore grade 45, I'll post an update soon about the outcome of using it as a PDMS / Sylgard 184 replacement.
: Looks great! Once cured - oven, 60°C, 30 minutes - the silicone rubber "SF-45" is as transparent as the PDMS remnants, yet strong and flexible. I'll give it a try with the vat!