Alternative Grey Pro supplier?

The last postings re: ApplyLabWork alternative resins was 2018. I see they have a “Prototype Robust Engineering” resin called “Champagne” that has similar properties to Grey Pro. Anyone tried this in a Form3? If yes, what PreForm resin do you use (Grey 3 or 4 or something else)?

Can ALW’s resin be printed in 25 micron layers? I have many small diameter parts that could benefit from this but GreyPro only allows 50 and 100.

ALW’s web site also has instructions re: using FL’s cartridges which answered one of my questions before I asked it!