I was gonna drive my friend to work today but my car had a flat. I found a little piece of metal in the tread which I know can be plugged. Then I found two super tiny holes in the sidewall from who knows what. I know those cant be plugged but can they be patched from the inside? The tires are relativly new and I dont want to buy new tires for these rims because I want to get some 18's soon. Are patches safe?