your UV damaged headlight lenses need the two pack in a can clear varnish treatment .three grades of whet and dry abrasive plenty of soap and water .. 600 grit for starters then 800 grit and finish with 1000 or 1200 grit . rub the abrasive on a bar of soap and use plenty of water . One €30 euro can of two pack clear varnish will be enough for three cars / six headlight lenses . start with a mist coating then two or three full cover coatings . Test for next coat by touching the masked area it should be tacky but not wet . leave overnight under cover to allow for a crystal clear long lasting result . Over 3 years and still like the day I did the lenses .