Safest bet is to rewrap. With that said, I've had a catastrophic leak (or several) getting to "know" RTAs, and I usually just take the batteries out immediately and wipe them down, checking for any leaks inside the casing or tears. I let them dry out, and assess whether or not I need to rewrap. Usually, since I catch them early (these days, LOL) I don't need to rewrap, but when I am in doubt, I do so. I've gotten to the point now where I can pretty much tell if I need to rewick an RTA a bit BEFORE it starts leaking, but believe me when I say I have leaked onto batteries and not had catastrophic results (though I do exercise care and caution and etc.)
Anna