Over time acrylic / fiberglass swimming pool steps can get small hairline cracks in the step’s coating. This doesn’t cause leaking however overtime the pool water can breakdown the resin or fiberglass which can cause problems if not fixed.
To repair cracks in your acrylic swimming pool steps, check your local hardware of boat stores for fiberglass gel repair kits and paints. Repair the crack with the repair kit, then you can paint over the repair with a matching paint. Alternatively, you can repaint the entire step unit so the colors match (or if you just want a new color!)
If your cracks are more pronounced and not able to be repaired, you may have to replace your swimming pool steps with a new set. Royal Swimming Pools offers a wide variety of swimming pool steps for both new and existing swimming pools.