I have used Mares and Dow in two of our house skylight projects. Once in 2018 and again in 2019. Both times their skylight evaluation technician came and measured and made a recommendation. That process was easy and professional. The installation, when the skylight was manufactured, was equally professional, rapid and well done. I would recommend Mares and Dow to anyone with skylights that need to be replaced with new state-of-the-art UV and infra-red resistant skylights. They look just like glass but they work perfectly.