Did you know that DER Windows Aluminum products use Sherwin Williams Powdura 4000, our aluminum extruding supplier Gateway Extrusions has gone through a major upgrade to meet the demands of the production. One of the major upgrades was a new vertical paint line which includes using Powdura 4000. The benefits of the Powdura 4000 is that it already meets or exceeds AAMA 2604 specification as well as providing substantial resistance to abrasion, impact, scuffling, and scratching. Not only that but because it is a Sherwin William stock item which shortens the lead time on painting our aluminum extrusions (7 days Vs 4 weeks) and easily achieving a crystal clear color matching.