Rex fur is my absolute favorite……sooooo velvety! It is quite alien in comparison to regular fur though and takes some getting used to. With my 2 former Rex bunnies, this was what I learned. First… I noticed with both rabbits….when they were young they were able to shed completelyon their own for the most part gradually. It was a gradual pattern fur loss shed. As they got older and older….. they needed more and more help shedding and removing loose fur. When they were seniors, they couldn’t even bend/stretch to get to some areas all-together and needed a LOT of help removing the loose fur – and the fur would come out in larger sections/chunks at a time as opposed to an all-over puffing shed like when they were young.
While I’m sure everyone has different techniques that work for them, I personally would do regular hand-plucking and gentle rubbing/scratching during their molts (I did this outside, and always face downwind or I would be covered in fur) …… once the shed was over I honestly have never done anything special. They groom so often, they would keep their coats in great shape on their own… and I found that just the regular petting/body rubs and scratches my 2 liked so much would keep their coats in good shape. During any molts… I’d be continuously removing the loose fur to keep them from ingesting much of it (I use papaya tablets during molts). I’d just sort of gently pinch the loose looking fur between my fingers and gently pull away…all loose fur would come out. They really enjoyed the grooming. Mine hated brushes, would get aggravated with me over them, but enjoyed the hand grooming.
I know just what you are going through…. I just found myself in a sudden and unexpected possession of an Angora. Talk about having to learn a completely different grooming style! Good luck with the fosters!