You have options for deck safety, comfort and style. A color stain can be purchased for around $4 per square ft, while decorative overlays can be purchased for about $10 per square ft. The average cost for concrete stamping or stenciling is $15 per square foot.
It is used to build pools but fiberglass can also be used to resurface concrete ones. Fiberglass is superior to plaster in that it is waterproof and can withstand stains. It also has a smooth texture and comes in many colors.
If you don't have any idea what your old paint is, you may be able to scrape off a few pieces and have them tested by a local paint shop or sent them to Ramuc. Acrylic pool paints start at $50 per gal and epoxy pool paints at $100 per gal. One coat should cover 100 sq. feet per gallon.