Quote Originally Posted by k_leos View Post
tendency is for water to seep thru the unplugged hole there by causing rust to your steel belts which are sandwiched between your patch and rubber threads. hence better plug kasi the seal is done inside and out. therefore water wont seep thru the hole. steel belts wont get rusted.".

So with cold patch inside only, won't it rust the steel belts since water can go inside without any plugs?
Maybe one shouldn't fret too much about this.

If, (and by the time it takes) those belts to start to corrode it would probably be high time to replace the tires na rin anyway. Tipong thousands of km na rin natakbo or over 6yrs na rin yung gulong from manufacture date.

That is, if you have a good quality tire (not necessarily expensive) naman and don't abuse it sobra. As for those cheaper ones from China that look similar (on the outside) but actually differ in terms of quality (its what's on the inside that really counts!), ewan ko lang...