thanks windyville1. the crack down the middle was 3/8 inch deep/wide or better took me forever filling it with poly from a few hypo needle that my next door vet give me. fill it let it dry then fill it again day after day.that crack and a hundred smaller ones. sanded it with a belt sander to start with then a vibrator sander then hand sanding blocks and a lot of just using my fingers and sand paper in the tight spots. oh a hundred hours or so in that floor.
