Cracked Stair Repair (New Treads)

I’ve completed repairing my cracked top pool stair by attaching new treads that I scribed to each existing stair and beveled to fit. Each stair surface was sanded with 60 grit as well as the bottom of each tread to promote better adhesion. I used Pettit marine silicone sealant / adhesive for the mating surfaces and made the bead around each tread with one of their UV resistant silicones. Both are below waterline rated, so hopefully it will hold up well. The tread itself is Timbertech Advanced PVC, which is their full PVC product, so no worries about swelling or rotting. I went with a fascia board dimension so each tread could be a single piece, and at only 1/2” thick, would more easily conform to the step shape and minimize the change in stair rise. I also drilled several holes before starting and filled the void behind the stairs as much as I could, which worked out to 400lbs of sand. Now in the process of refilling the pool and getting everything balanced again.