been there done that: Windsor & Newton Art brand retatders/extenders with IPA:
Results: Inconsistent with several brands & disaster with Vallejo due to IPA.
My 2c/Tuppence h'apenny:
Stick with the brands' own thinners retarders/extenders, you will get much better consistency & repeatability...
Tamiya will work with IPA, Halfords' (UK) own-brand windscreen wash, but best with X20a.
VJ ModelAIR will only work consistently with own brand Thinner, Future (!) or Ultimate brands, my preference is MEDEA brand airbrish cleaner.
VJ Polyeurethane Primer thins a little with Future.
Hataka will spray, but is very fragile on anything that isn't primed especially resins, use their thinner.
Xtracrylics thins with Medea brand or their own.