Roofing waterproofing membrane is aging and cracking in a large area. Can I brush polyurethane waterproof paint?

The waterproof membrane of the roof is aging and cracking in a large area, and the polyurethane waterproof coating can't drain water. Drainage only fills tiny holes, and the cracked part needs to be filled with other fillers.

Polyurethane is called polyurethane, which is the general name of macromolecular compounds with repeated carbamate groups in the main chain. It is formed by addition polymerization of organic diisocyanate or polyisocyanate with dihydroxy or polyhydroxy compounds. Polyurethane materials are widely used and can replace rubber, plastic and nylon. , can be used in airports, hotels, building materials, automobile factories, coal mines, cement plants, senior apartments, villas, landscaping, painted stone art, parks and so on.