Don't try the fiber glass repair kit...doesn't work...but duct tape does!!! Doesn't look pretty, but by golly it works until you can get it reskinned/get a new one.

Gaffer tape works ok, but you have to replace often...it doesn't hold up to waterings and it's not great in the heat.

Athletic tape works well, too. Stands up to waterings better than gaff...

Yes, I've tried all of these. Like I said, we go through about 3 heads/year average.