The strangest one I had was trying to repair a GRP hull of a boat which had gone adrift in foul weather. It was still firm on the rocks and as the tide was coming in we had to make an emergency repair.
Weather was bad and cold so we had the fibreglass mat, resin, catalyst and accelerator ready. I mixed the resin, cat. and accel. liquids together whilst my mate went inside to hold a piece of hardboard against the hole. Got the mat on and dabbed the resin mix as fast as I could. It was reacting so fiercly that smoke was coming off the mix and the brush was wealded onto the hull! Managed to float it and got it back to harbour safely for proper repair! Touch and go though.