This isn't a woodworking question but one of very great importance to me. I added onto a 20 x 20 shop about 18 months ago and haven't finished the outside. The first section is a statesman building. When we put the floor down and came on the outside with the T-1-11 siding the raw edge of the floor remained visible. It was to be sealed and covered with a horizonal board. Hasn't happened yet and the rain is now soaking into the raw edge. Question is , what can I put on the outside raw edge to seal it before putting the horizontal board in and sealing it? Also how would you seal the last board? Thanks for the help. This is on my to do list for the month of September.