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It is not mandatory
If your turtle's shell needs a fiberglass patch, consult a veterinarian or herpetologist. He or she will direct you to someone who specializes in prosthetics for animals.
patch
If it's cracked, it might be made of fiberglass, or plastic. Fiberglass patch or two part epoxy.
The patch will hold better if you remove the existing patch. If you patch over the existing patch, make sure all the edges are sealed off. If you are tired of replacing your vinyl liners, you might want to check out fiberglass as an option. A new fiberglass surface can be applied to your pool, and you will get a much longer life out of it. You can read more at: http://www.advancedpoolcoatings.com
patch
To repair a crack in fiberglass, you must first sand the area until it is smooth. Then you must apply a patch to the area and bond it with liquid fiberglass. Once it is dry, the patch must be sanded smooth and then finally painted to match.
There was a hole in his trousers, but he got a patch and repaired it.
use a tire patch kit
Cover/fill the hole..
packing tape.
you want to make a hole in a muffler or you want to patch one up. Make a hole you can use a drell patch a hole best use sheet metal and rivets then muffler puddy around that