I love this Quick Tip I read in "Kovels' Advertising Collectibles Price List" and wish this was something I knew about a long time ago.
Have a tear on a piece of cardboard? Repair tears on
with Fray Check!
I would not do this on something that is very valuable, especially if I was planning to sell it. In that case I would look at getting the item professionally repaired. But for something that is for my own enjoyment and not worth huge bucks, this could be a great trick.