Florida Stucco GM-SBS 80 lb Bag Double Sky Blue Gem Pool Finish. Factory blended with the highest quality selected colored quartz aggregates, white portland cement and proprietary additives to enhance strength, density, bonding and curing. A Gem Pool Finish will yield a hard, long lasting surface highly resistant to stains and spot etching prevalent with traditional pool plasters. Exposure of the aggregate produces a safe, slip resistant surface that attains a compressive strength in excess of 3500 psi in 24 hours and exceeds 7000 psi in 28 days.