QUOTE(AureusX @ Oct 15 2018, 10:47 AM)
If you don't mind me asking it here, which brands of tint do you guys recommend?
I'm looking mostly at effective heat rejection, Smart Tag, GPS & smart card compatible, and approved by the JPJ. (Also, value for money

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I currently have Vkool installed on my 10-year-old Tucson. The heat rejection is quite good and it is holding up well after so many years. BUT! It interferes so much with the GPS and Smart Tag detection. I'd have to always wind down the window just to get reception for the smart cards and GPS

Approved by JPJ as in won't be stopped in road blocks, or pass Puspakom inspection? If you go for approved by Puspakom, your tint VLT has to be 90% in order to be meet the final 70% VLT spec for front windscreen. Such film will not give you very good heat rejection compared to a tint that has 70% VLT, for example. Once applied, the final VLT will fall even further.
For front windows, the law says 50% VLT. That means you probably need a 70% VLT tint to pass.
As for the rear windows and windscreen, it's 30% VLT requirement. You have more options here, but that will mean having 2-tones (lighter from front windows, and darker for rear windows, as you can see in almost all Singapore registered cars). Many tint shops bosses I spoke to seem to be telling me their customers hate the 2-tone application.
3M crystalline will have issues with Smart Tag, but no issue with my apartment gate. To overcome this, the installer did not tint the dotted section behind the rear view mirror in the front windscreen. Downside is I need to place my Smart Tag there when passing toll booths.
I love this 3M film, as the heat rejection and vision clarity (especially at night) is good.