We utilize several of the AP systems, from racks to several cages and we love everyone of them. Ali is a joy to talk to, and she does a great job! It's no wonder Mark has kept her as long as he has!
The last time I spoke with Mark about getting some Flex Watt from him for my terrestrial cages, he said they were running about 6 weeks out at the time. I think that is about standard for them.
That's called a company with a fantastic product! It's the guys that have a ton of cages sitting around their warehouse I would be leery about ordering from.
As far as your sealant goes, I wouldn't even bother, as it comes out after the first couple cleanings. It has come out of every cage I've put it in.