I use the Eimann Fabrik Clear Pearl Instant Detail Spray. It works very well for me when using the menzerna products.
No, I haven't done a lot with layering yet. Still experimenting with a few sealers
Klass SG
WG
EX-P
FMJ
All of them are a little different. FMJ is very easy to wipe on and wipe off, and it works VERY well with the menzerna line (even thought I've read here that menzerna doesn't produce it).
With AIO as a base, I really like the WG.
I just started using PB products, and for the $, they seem to be great value.
I'm very impressed with the SSR2.5, especially since I can use it with the PC to remove/reduce defects. I hate breaking out the rotary all of the time because you have to deal with taping the panels, splatter clean up, etc.... which is time consuming.