I am glassing and restoring and old ash canoe paddle and have gotten to the stage where I thought I could do my finish sanding before the varnish. After 3 days I am still able to dent the epoxy with my fingernail and even scratch off a high spot that was sticking up. I had started sanding after 2 days with 220 grit before I noticed that it was still soft. No dust was produced and the epoxy piled up in soft patches that later hardened. The only thing that I can think of is that my mix ratio was not right. I have the west system and pump set with the correct pumps attached. My first epoxy and fiberglass application used one pump on each with very little left over. I repeated with 2 more coats and then I sanded and had good results. The surface was gray and very smooth. I then started building up the layers with epoxy and plastic applicator to get my 5 or 6 coats. After the next coat I had about half the epoxy left in the cup and going to waste. I decided to make half a mix the next and subsequent times. I measured the pump travel distance and divided it by 2 and made a mark. The next 4 coats I pushed each pump down to this mark and mixed the epoxy. I wouldn't think this would pose a problem but as this is my first epoxy and fiberglass project I'm not sure. Can anyone help me with this situation? Should I let it cure longer or is it never going to harden? What should my next step be? Thanks for any help.