From http://www.swimmingpoolsteve.com/pages/pool-plaster.html - Swimming pool plaster is not a do-it-yourself project. There is no way you could plaster a swimming pool if you have no experience. Plastering a pool is harder than it looks. Plastering a pool cannot be done in stages; it must all be done all at once in one shot. Do not attempt to plaster your own swimming pool.