Silicone
Tim,I got it from home depot and didnt pay attention as to the brand, probably the cheapest !..........I think they are all about the same. even the clear after a year or so turns to a dirty brown color. I dont worry about it, too small to notice it.Sounds like you got a good start for this season , bearings all packed and ready, I don't know how far you tow your boat, but I tow 100 miles round trip, for this reason I carry a spare HUB and bearings, this has saved me twice, once for my self, and another club member who lost his bearings on his 170 trailer, he was about 150 miles from home but we got him back on the road in about an hour. I think a spare hub and bearings cost me about $40.00, nice to have. I have a plastic tote box that I take with me when ever I tow, it contains everything I need to work on the trailer including, sml hydrolic jack, bearing grease, rags, wirring, bulbs, hub. this and my tool box are at the top of my check list.here is a good source dennis@sailing-obsession.com (Day Sailor Forum)of information on the 170 with several good post., go to "tack room" for the foam articles, if you need a drawing of the mast head, send me an e-mail and I will send it to youI got carried away here, sorryGlenn