I'm using rhinepro black beauty 50%vlt for front and side, 30%vlt for back and rear. 2mil on my persona for less than 1k. Works superb for heat rejection and also glare and unwanted views. 4 mil will cost more and i went for 50% despite being illegal cause the 70% vlt has a blue cast which is rather irritating.

Did mine at authorized dealer near kwsp puchong. You can go there ask for quotation if interested. Got other options. I think their workmanship is quite ok, price not too pricey and really good heat rejection. I only used it for 1 year and so far so good le.