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Old     (sanger)      Join Date: May 2002       05-10-2005, 3:35 PM Reply   
Anyone know the type and name of sealant I should use when installing the ballast system vent and intake scoop thru hull fittings? Also should I use a 3/4 inch hole saw or 3/4 inch drill for drilling the vent holes?
Old     (jklein)      Join Date: May 2001       05-10-2005, 3:39 PM Reply   
3M 5200 series. There's a variety of stuff with the 52xx number on it. Some is quick dry (10 hours) some is not (48 hours). West Marine has a bunch.
Old     (sanger)      Join Date: May 2002       05-10-2005, 5:40 PM Reply   
Thanks John, I'll be at West Marine this week so I should be able to pick some up. John did you happen to drill any holes in your boat hull for vent lines?
Old     (jklein)      Join Date: May 2001       05-11-2005, 9:29 AM Reply   
"vent lines?", Do you mean ballast overflow lines? If that's what you mean, no. However, I'm probably going to do that pretty quick here. I did overflow one bag somewhat, and luckily I caught it in-time. However, I'm now parinoid about overflow, so I'll be adding the overflow ports with check valves soon.
Old     (wakejunky)      Join Date: Apr 2002       05-11-2005, 12:55 PM Reply   
The factories, or at least CC, uses a stuff called Sikaflex. Really sticky stuff and takes forever to dry. I'm sure there is equivalent 3M available as John said.

Get the Grip you Deserve
Old     (denverd1)      Join Date: May 2004       05-11-2005, 2:05 PM Reply   
hole saw. but be careful, you may need to drill a larger hole for 3/4" TH. I ended up using a sand stone to make it fit. Mine were 1" and I think the hole saw was 1 1/8" or something like that. blue masking tape, drill in reverse. i'm sure you've read up on it
Old     (jklein)      Join Date: May 2001       05-11-2005, 3:34 PM Reply   
nacho's right on the money with the hole saw and drilling in reverse until you're through the gel coat. That's how I did mine.
Old     (sanger)      Join Date: May 2002       05-11-2005, 7:48 PM Reply   
Thanks guys, It still doesn't seem right to drill holes in the boat hull but I'll get over it
Old     (jayc)      Join Date: Sep 2002       05-12-2005, 7:12 AM Reply   
Sikaflex is the way to go. Its probably the best sealant / adheisive on the market.
Old     (jklein)      Join Date: May 2001       05-12-2005, 11:02 AM Reply   
Just make sure that where you put the hole has enough room for the hardware to mount inside the boat without hitting an immovable object like the oil pan or something like that. On the outside make sure it will not be impacted by a trailer bunk.

Measure three times, tape it off, mark it with a pencil, measure again, drill a pilot hole, then use the hole saw.

Good Luck. BTW: I'm not giving you any advice and do not take any responsibility for the consequences of your project.


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