anyone have luck with tire sealant for slow leak?

[secamike]

Low and behold I found out my lower front time pressure issue was a very slow leak - about 4 psi or so a week. Just enough that I have to fill it each weekend to keep a working pressure. I sprayed it down and it looks like a really minor bead leak about 3" along the edge of the rim. Anyone had luck with using tire sealant for something like this? I cranked up the pressure to max for a few minutes but it didn't help - looking to avoiding bringing it to the shop until I have to. Last time it was in I asked about cost to swap out my tire stems for steel ones and it was like $100 even though they had the bike torn down a bit.