New batch car, arrived 20 Oct 2016, can say no problem of this sort so far. Both Econ on or off.

Bro pmed.

After ask in fb come ask here ka?...😀

I do 2 film type. This is due to the fact that your security tint won't have the best solar specs while your dollar specs do not have the best security specs.

So this way your security tint do not need to have good solar specs or even can have clear ones, I did it that way, as these type are cheap. My SA even have 3m contacts and they give the security layer free. So security tint 4mil plus 3m crystalline which is 2 mil will give you total 6 mil. Your average vkool security spec. Any thicker will run into possibility of over stressing your power window.

Anyhow the more layer, the more impact each layer will absorb. However it also means more work for tint guy. Especially when if there are bubbles which did not clear after 2 weeks.