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Author Topic:   screws in transom

Petero posted 06-01-2000 12:11 PM ET (US)
I'm going to install a speed/temp sensor on the transom of my 18 Outrage and I'm concerned about making sure that the screws (2 beolw the waterline) won't allow water to seep into the foam core. Any advice/suggestions would be appreciated. Thanks.
kingfish posted 06-01-2000 12:31 PM ET (US)
Almost anywhere (maybe everywhere) you'd drill on the transom for your transducer(s) and wire looms, etc. will be backed with wood - having said that, keeping water from seeping in is still important!
Commonly accepted practice is to drill your holes (touch up the very outermost portion of the hole with a counter-sink or much larger drill bit so as not to chip or split the gelcoat with the screw)and squirt a good grade of marine silicone or polyurethane/silicone caulk into the hole prior to putting in the screw.
If you really want to be obsessive about it (and sometimes that's a fun thing to be) you can drill oversized holes, deeper and greater diameter than the screw, gouge out the backing, whatever it is, so the void is larger than the hole through the surface, fill with epoxy, and drill into that once it is set up, so the screw hole is entirely inside of the new epoxy. This method could possibly cause the nead for some gelcoat patch work prior to drilling the screw hole.
I'd just use the caulking, though.
regards,
JCF
frank posted 07-17-2000 01:20 AM ET (US)
i used boat life poly sealant from west marine on my 18 ft outrage. when i drilled the holes water seeped out . please let me know if this happens to you.
andygere posted 08-06-2000 01:19 AM ET (US)
3M 5200 Sealant is about the best stuff around for this purpose. It's also a good bonding agent if you have the time to let is set up (a few days).
andygere posted 08-06-2000 01:19 AM ET (US)
3M 5200 Sealant is about the best stuff around for this purpose. It's also a good bonding agent if you have the time to let is set up (a few days).

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Author	Topic: screws in transom
Petero	posted 06-01-2000 12:11 PM ET (US) I'm going to install a speed/temp sensor on the transom of my 18 Outrage and I'm concerned about making sure that the screws (2 beolw the waterline) won't allow water to seep into the foam core. Any advice/suggestions would be appreciated. Thanks.
kingfish	posted 06-01-2000 12:31 PM ET (US) Almost anywhere (maybe everywhere) you'd drill on the transom for your transducer(s) and wire looms, etc. will be backed with wood - having said that, keeping water from seeping in is still important! Commonly accepted practice is to drill your holes (touch up the very outermost portion of the hole with a counter-sink or much larger drill bit so as not to chip or split the gelcoat with the screw)and squirt a good grade of marine silicone or polyurethane/silicone caulk into the hole prior to putting in the screw. If you really want to be obsessive about it (and sometimes that's a fun thing to be) you can drill oversized holes, deeper and greater diameter than the screw, gouge out the backing, whatever it is, so the void is larger than the hole through the surface, fill with epoxy, and drill into that once it is set up, so the screw hole is entirely inside of the new epoxy. This method could possibly cause the nead for some gelcoat patch work prior to drilling the screw hole. I'd just use the caulking, though. regards, JCF
frank	posted 07-17-2000 01:20 AM ET (US) i used boat life poly sealant from west marine on my 18 ft outrage. when i drilled the holes water seeped out . please let me know if this happens to you.
andygere	posted 08-06-2000 01:19 AM ET (US) 3M 5200 Sealant is about the best stuff around for this purpose. It's also a good bonding agent if you have the time to let is set up (a few days).
andygere	posted 08-06-2000 01:19 AM ET (US) 3M 5200 Sealant is about the best stuff around for this purpose. It's also a good bonding agent if you have the time to let is set up (a few days).