general finishes exterior 450 water based wood stain, 1 quart, natural base general finishes general finishes exterior 450 stains are premium quality, exterior pigmented wood stains designed for outdoor projects with vertical surfaces such fences, patio furniture, garage doors, entrance doors, outdoor kitchens and interior windows. these outdoor water-based wood stains not recommended for a deck finish. exterior 450 stains contain u.v. absorbers to protect the finish and mildewcides to retard mold.