I have this older Blackhawk floorjack I bought back in the 80's Its a well made professional unit but developed problems so I got a kit and rebuilt it. Now it has a leak issue. The problem is there are no seals or o-rings around the cylinder - either top or bottom. When I assembled it I used some Loctite form-a-gasket but it leaked. When I took it apart this time I found the crap hadn't set up OR the hydraulic fluid reacted and dissolved it. Either way, its leaking. So I'm looking for a better product to use. I don't think silicone is going to cut it AND I hate using that crap 'cause it crumbles when you take things apart and the bits get everywhere. I'm thinking I need a sealant that will set up hard.