[spudd]

Body fillers are in fact not lacquer based. They are polyester
Some of your spot puttys are but rule of thumb is if it requires a Hardner it is not lacquer based

Your non hardened fillers will be affected by most of the above methods and should be removed if you do use strippers as it will adsorbe any meteral you use to strip with

If you use a catalyzed filled you stand less of a chance of contamination by your stripper

I have been in the auto body business for 30 years and have done some testing for evercoat in my shop