You experienced types know this already but for anyone new to building a kayak pleased don't make my mistake. It was time to wet out the glass and I had gone through two batches already. I measured out the resin for the next batch when the phone rang. No problem I thought, the hardener is not added yet and off I went to answer the phone. Later, when I was checking to see if the resin had set up enough to put on the second coat I found one section not setting at all. I don't know if I simply forgot to add hardener to that batch but it made a real mess cleaning it up and removing wet glass before adding a patch of new glass and starting over. It looks kinda OK now but I'm starting off with what I once saw someone described as "character" built into my boat. Yes, I know it will float. Yes, I know it's not a piece of furniture. Yes, I know hardly anyone else will even notice. But I still feel a bit stupid. In future, there will be NO interuptions permitted.