SL/R231: Window tint "rainbow effect"


BUT
On my E300 just turned in had EXPEL by LLumar window tint (wanted same EXPEL but same installer said Formula 1 better and LLumar doesn't sell EXPEL tint any longer anyway).
I did not have the "rainbow effect" with the EXPEL but, after 4 days I do have it with the Formula 1 when wearing sunglasses.
Any ideas as to why I'm getting this "rainbow effect"?
Possibly due to water not fully dried out (I hope) ?
Any of you who have Formula 1 notice this?
so the combined use givespretty rainbows effect.
Choice is different tint ot non polarized glasses.
Proof is remove glasses rainbow gone





