I recommend you go with flat white paint, Mylar just sucks ... I used 2-mil. DuPont Mylar (the best, and pretty expensive) ... after a couple grows, the surface was so dulled, and fogged, it wouldn't reflect light worth a damn ... waste of money ... my next cabinet will likely be built, using Home Depot's 'Tileboard' ... it's a 4' x 8' sheet, about 1/8" thick, that has a waterproof, white porcelain-like finish on one side ... it's used for bathroom/shower walls, etc., and for making 'dry-erase marker boards' ... only costs about $9 a sheet, too ... :thumbsup: