While the aggregate in common concrete (such as is used to pour slabs and sidewalks) is stone gravel in a blend of sizes, in pool plaster the aggregate is fine quartz sand (also called silica sand, quartz being also called silica) or very fine marble dust. Pool resurfacing costs. O'Hanlon and Maroney say resurfacing with the pebble-based material costs $4.75 to $5 for each foot of internal surface area. Therefore, a pool with an internal area of 1,000 feet will cost around $5,000 to resurface. The entire plastering job takes 2-4 hours.