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Old 05-17-2020, 12:01 PM   #1
thinkxingu
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Default Dinghy Transom Gasket

Greetings!
As some of y'all might remember, a fellow forum member gifted my son an aluminum rowboat last summer. Well, we're replacing the rotten transom this next week and are wondering what to use for the gasket material that goes between the aluminum and wood to seal it tight.
Looking for inexpensive and easy!

Thanks!

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Old 05-17-2020, 04:05 PM   #2
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Flex Seal! Flex Paste! that TV guy seals everything with that stuff! Of course you are going to be using fasteners from aluminum to wood as well. Find screws that will not “interact” with aluminum or rust.

ishoot308 could suggest what screws to use perhaps?
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Old 05-17-2020, 04:44 PM   #3
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Flex Seal! Flex Paste! that TV guy seals everything with that stuff! Of course you are going to be using fasteners from aluminum to wood as well. Find screws that will not “interact” with aluminum or rust.

ishoot308 could suggest what screws to use perhaps?
I was hoping to find something in a sheet that I could cut to fit...

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Old 05-17-2020, 04:47 PM   #4
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Default Stainless Steel

Stainless steel fasteners are used when connecting different metals. 🐻
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Old 05-17-2020, 05:13 PM   #5
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I would use aluminum screws only. Stainless is an alloy of carbon steel and will eventually react with aluminum especially in a wet environment. If you really must use stainless for its strength, I would use a nylon washer under a stainless washer of the same size, preferably a fender Type washer. This will keep the dissimilar metals from touching. Drill pilot hole through the aluminum slightly over sized to avoid the stainless from touching it as well.

As far as a gasket, I would simply apply a high grade silicone sealant, bolt it together and clean up the excess.

Good luck!

Dan
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Old 05-17-2020, 05:23 PM   #6
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Originally Posted by ishoot308 View Post
I would use aluminum screws only. Stainless is an alloy of carbon steel and will eventually react with aluminum especially in a wet environment. If you really must use stainless for its strength, I would use a nylon washer under a stainless washer of the same size, preferably a fender Type washer. This will keep the dissimilar metals from touching. Drill pilot hole through the aluminum slightly over sized to avoid the stainless from touching it as well.

As far as a gasket, I would simply apply a high grade silicone sealant, bolt it together and clean up the excess.

Good luck!

Dan
Dan,
Do I need to do the whole back of the transom with sealant, just the screws, or a ring on the outside to seal the "inside"?

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Old 05-17-2020, 05:31 PM   #7
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Dan,
Do I need to do the whole back of the transom with sealant, just the screws, or a ring on the outside to seal the "inside"?

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I would put a good circle of sealant around the screw holes on all three areas, outside, inside and middle. I would also pump some sealant in screw holes just prior to installing bolts.

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Old 05-17-2020, 05:40 PM   #8
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And make sure you do not use pressure treated wood against your aluminum.

Dan
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Old 05-17-2020, 05:44 PM   #9
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And make sure you do not use pressure treated wood against your aluminum.

Dan
Right—we have two pieces of oak with multiple layers of L'il-Buddy-applied exterior urethane!

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Old 05-17-2020, 05:46 PM   #10
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Right—we have two pieces of oak with multiple layers of L'il-Buddy-applied exterior urethane!

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Your good to go then!
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Old 05-17-2020, 06:09 PM   #11
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He got out today, but we had to throw some tape over the transom holes!Name:  20200517_130329.jpeg
Views: 1406
Size:  39.8 KB

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Old 05-17-2020, 07:30 PM   #12
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That's great! So nice to see the next generation explore the beauty of the lake.
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Old 05-17-2020, 10:46 PM   #13
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My preferred sealant is 3M 4200. It is good for above and below the waterline.
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Old 05-18-2020, 06:31 AM   #14
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My preferred sealant is 3M 4200. It is good for above and below the waterline.

Mine too. I also like Loctite PL. Seems to be basically the same stuff and is often easier to find in tubes that fit in a caulking gun. They sell it at Lowes.
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Old 05-18-2020, 07:11 AM   #15
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Maybe a dumb question, but will gutter seal work? I've got a brandy new tube already...

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Old 05-18-2020, 07:29 AM   #16
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Maybe a dumb question, but will gutter seal work? I've got a brandy new tube already...

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I’m sure it will...once you tighten the bolts down and squeeze everything together you're just forming a gasket around the screw holes. No big Deal...

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Old 05-18-2020, 08:46 AM   #17
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Thanks again!

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Old 05-18-2020, 09:22 AM   #18
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He got out today, but we had to throw some tape over the transom holes!Attachment 15996

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Have you named the rowboat yet ? Is that Jetti 1 i see off to the right of the rowboat in the pic ?
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Old 05-18-2020, 11:46 AM   #19
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Have you named the rowboat yet ? Is that Jetti 1 i see off to the right of the rowboat in the pic ?
Jettie One stayed on the trailer yesterday—it was a chill on the beach while L'il Buddy explored kinda day.

As for the name: it came with one that had a history, Harambee, so that will stay. We do sometimes refer to it as Boatie Three, though!

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Old 05-18-2020, 02:19 PM   #20
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He got out today, but we had to throw some tape over the transom holes!Attachment 15996

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Years and years later it's a bit hard to remember the feelings of a moment like this. However, the memory of the experience doesn't ever really fade.

Good for him/Good for you!
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Old 05-21-2020, 05:43 AM   #21
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Years and years later it's a bit hard to remember the feelings of a moment like this. However, the memory of the experience doesn't ever really fade.

Good for him/Good for you!
Pictures, lots of pictures.

What I find most hard is trying to remember how this would've felt as a kid. For example, my wife texted me a pic of him anchored just outside the swim area with a laughing emoji—we expected him to head much further out—but for a 9-year-old, that's gotta feel like being in the middle of the lake!

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Old 05-21-2020, 02:28 PM   #22
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I'm one of those who learned about boating by "rowing" a wooden, 8-foot boat while it was tied to a dock (three feet of water).

Oddly, I still remember it as being great fun!
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