Jun 08, 21The problem of plaster spotting has been an ongoing puzzle and controversy in the swimming pool industry for over three decades The generally round, smoothyetunsightly white soft spots in new plaster pools have long been a source of contention among pool plasterers, and pool chemical serviceWoncote Smooth is a onecoat interior finish plaster designed for use over veneer gypsum base boards, masonry block, or concrete surfaces Woncote offers a hard, white, abrasionresistant surface Packaged in 50 pound bags, this product is designed for smooth trowelled finishes and textures Coverage is 115 – 135 square foot per bagNov 28, 17"Smooth steel trowel" finishes are not recommended Applying a "smooth" finish requires the substrate beneath the finish to be very smooth and making a plaster brown coat smooth is difficult at best and also an expensive process It is recommended to use either sand fine or sand coarse finish over a traditional plaster brown coat White Co...