DIY kits are limited in strength and durability. They usually fail within a month or two. They typically consist of an epoxy coating that takes up to 5 days to dry and yellows significantly over time. Most kits are rolled or brushed on the fixture, giving an unsightly looking amateur finish. Some kits are sprayed on with an aerosol can, causing uneven coverage, . The mirror-like finish you really want cannot be achieved without proper training and experience and professional spray equipment.