Normally the fiberglass resin jelly is a good product. From the seller, I bought from it came 2 days late and when it arrived poorly packaged the cream hardener was busted open. The fiberglass resin jelly can was beat up and open as well. The fiberglass resin jelly was crystallized as well. Would have saved time and hassle if I had gone to O'reilly's. The only plus is Amazon did refund my money.It cracks away from wood when the temperature outside goes above 80 degrees. Since I was using it to fill cracks ina carved tree trunk, this was disappointing. It is black in color. That wouldn't have been my choice had I realized.When thinned out a little with styrene and used with fiberglass cloth, you can make a super strong patch that you can apply in any position including upside down.