[quote=gahamby]I have had some recent experience with this. The mast on my SC15 leaked at the head and hound. This resulted in going turtle after a capsize and a difficult righting. I removed the mast hound, cleaned it all up, bedded it with 3M 5200, and refastened it with machine screws into tapped holes. The screws are the manufacturers recommended method. I also needed to install an Aussie hook at the masthead. This required removing the cap in order to through bolt the hook. The cap was originally riveted. This item, too, I bedded with 5200 and machine screwed into place.
I did the same with the base. While I had the base off i tilted the mast head down and filled it with water. No water leaked out at the head or hound. I reattached the base in the same manner. On a later occasion I removed one of the screws from the base. As I loosened the screw air came out of the hole. I had positive pressure in the mast due to it heating in the sun. I found it possible to seal a mast airtight.
I believe sealed head stainless steel rivets are available. A dab of 5200 in the hole prior to setting the rivet and a dab in the hole in the rivet will seal it up nicely. All SS rivets are a bitch. Get the best rivet gun you can.
I had a situation on my H14 with a leaking masthead on a non-com tip. It had a stock Hobie foam block with an aluminum plate just below the mast head shiv block. I siliconed the foam in and sealed down the plate with 5200. This leaves only a small area below the shiv.
DG the mast in that video is pristine! Is that a refinish?
[url]http://www.hansonrivet.com/closed-end-blind-rivets.htm[/url]<!-- editby --><em>Edited by gahamby on Aug 16, 2016 - 03:13 PM.</em><!-- end editby --> [/quote]
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