07-12-2012, 06:33 AM
Join Date: May 2010
Location: Ponte Vedra Beach, FL / London, UK
My Ride: Jaguar XKE
Ultra Violet Protection
Originally Posted by sarahkate
Also, what is the best product to clean cloudy headlights?
Original equipment material (OEM) suppliers started to add ultra violet UV-B protection to the surface of the lens in an attempt to reduce the yellowing and cloudiness and prolong the usable life of the lens.
Removing oxidation or scratches from vehicle headlights or brake lights (also polycarbonate) also removes the OEM ultra violet (UV-B) protection.
Surfaces that have yellowed are a sign that the ultra violet (UV) sacrificial coating has failed and must be resurfaced and recoated or the yellowing due to UV damage will return
a) A coating product that contains UV protection (Opti-Coat or Aquartz) can be used once headlights are polished
b) Using a good quality acrylic urethane clear coat with ultra violet (UV) protection. There are chemicals that are considered UV blockers and other chemicals that work as UV absorbers; they are both different chemicals. Ultra-fine metal oxides deliver superior UV protection and significantly improved transparency and durability. 2K urethanes can be difficult to wipe on or brush apply as they set up quickly on applied surfaces and can leave brush marks, which will distort the optics, a paint spray gun or mall air spray unit is ideal.
In order to restore the lens back to its OEM standards a new UV resistant coating must be re-applied. Once both lenses have been polished to restore clarity, they should be sanded with 1500 grit finishing paper, this ensures the clear coat has a ‘key’ to enable adhesion. When you spray clear coat on the sanded lenses it fills in those light scratches and makes them clear and glossy making them look brand new.
SprayMax® (aerosol spray) is a 2K clear paint: two-component acrylic resins plus isocyanates hardener that contains UV-B protection. (18 USD)
Shake aerosol can vigorously for two minutes before activating. To activate, take the red button from the cap and attach it to the pin on the bottom of the can. Put the top of the aerosol can on stable on a stable surface and push the red button firmly and press the pin into the can. Shake again for two minutes to ensure activator is thoroughly mixed with clear coat.
Apply 2-3 light coats and allow 5-10 minutes between each coat. After the application of the final coat allow approximately 24 hours dry time or use an infra red (IR) drying lamp (recommended)