It is not mandatory
You can purchase a fiberglass patch for a turtle shell at a pet store that sells reptile supplies, an online retailer specializing in turtle supplies, or a hardware store that carries fiberglass repair materials. Be sure to follow the instructions carefully when applying the patch to your turtle's shell.
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
To patch a hole in a moon bounce inflatable, first clean and dry the area around the hole. Apply a vinyl repair patch over the hole following the manufacturer's instructions. Press firmly and ensure the patch adheres completely to seal the hole. Allow time for the patch to set before inflating the moon bounce again.
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.
To sew a patch over a hole by hand, first cut a patch slightly larger than the hole. Place the patch over the hole and pin it in place. Thread a needle with matching thread and knot the end. Start sewing around the edge of the patch, using small, even stitches. Continue sewing until the patch is securely attached. Knot the thread on the backside to finish.
To effectively patch a hole in the crotch of your jeans, you can use a denim patch or fabric glue to cover the hole. Cut the patch to fit the hole, then either sew it on or apply fabric glue around the edges to secure it in place. Make sure to let it dry completely before wearing the jeans again.
Cover/fill the hole..