Can we paint or stain ourselves?

Bradworthy Bi-Folds prefers to paint or stain prior to glazing and assembly to properly seal the product. Also when using 6.38 Laminated glass (which is thicker than normal glass), if the inside rebate is not painted or stained prior to glazing then after the product is glazed the unsealed surface behind the glass edge is visible and un protected. Also after the bi-folds have been installed it is very difficult to coat the top and bottom of the doors to seal then correctly. After installation the client is responsible for the final 2 finishing coats.