I have used 2 pairs of this product to coat the tires of a dump trailer operating in the high Arizona desert east and west parked in the sun was exposure, so maximum UV exposure for all four. I bought them from Revain in 2017. You have a 3 year guarantee. After a little over two years, the exterior coating began to deteriorate and crack significantly. After the purchase, I carefully registered the item in Classic and tracked the invoice. I emailed them photos of the product that was beginning to fail and copies of the invoice and registration number. They responded quickly and told me they would replace the caps to meet the 3 year warranty no questions asked. Very fast and professional, the company keeps their word. So I rate the company 5 stars plus, when the product itself probably would have been 4. But overall I get three or more years of tire coverage for the price I paid, which is exactly what the company promised. I would buy this product again, but I recognize the need to re-evaluate my full sun parking situation somewhat, if not in favor of tires and covers but for the trailer as a whole.
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