all tint will reduce the heat blocking capability after few years.

of coz they will say irr tser blabla. but that is DURING the installation.

try go back after few months, they wont even let u borrow their heat rejection detector. coz they know it wont be same as advertised.

IRR and TSER is just a marketing gimmick. no local government or independent bodies are monitoring this standards so this cincai shops can make cincai claims.