Tint it self definitely will not void your warranty, but the process when apply thint may void your warranty, exp. Normally they use blade to cut the tint paper on your window or windshield, it may scratch your paint work or the glass, also when they applied to the rear windshield the heater may broken, usually when they apply tint they will open the door panel it is also may cause rattling sound later on door panel, then you will go claim to SC.

How many mil ?