Quote Originally Posted by k_leos View Post

(edit: To add. To make patch more lasting, it's better to put gum or waterproof sealant outside so flood water can't get (from outside the tire) in the belts and plies that can rust them. So what is the best sealant to apply in the outside nail size hole, etc.? This is my last question. Thanks.)

to be honest you need not bother doing what you are asking. i do not see any gains you may obtain provided the repair was done properly. in all my years of driving i have some tires with as much as 2 seperate patches and not a single one failed as a direct result of the patch. this is a (too) long drawn out topic already.