When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I had to use my plastic cap for a day, long enough to get to Wal Mart and get a tire repair kit for bicycles. It worked, but not recommended. Just get one out of your spare tire!
I can say for sure you will be fine with the plastic cap. I've been doing this for a while. It definately won't fall off. As long as you see no leaks it's fine.