small leak in radiator

[aggiedave98]

I thought I'd find a lot of posts on this w/ a search, but didn't find much.

Anyway, I've got a small leak in my radiator. I'm not sure where, but if I crawl under the truck I can see some fluid at the lower point of the radiator. I fill up the overflow tank to the lower line every month or so. It slowly empties (as the radiator is leaking). Probably 6 months ago I put in some sealant that you pour in the radiator.

Should I try some more sealant? Is that stuff bad??

What are my other options? I think I've heard of places that will fix leaks. Is there a good way to find the leak??