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21 sea cat stringers

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Old 09-29-2017, 10:58 AM
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Default 21 sea cat stringers

So I started a complete restore on 94 sl1 sea cat. Got the floors and wet foam removed. The fuel tank on one side started leaking. Thats what got me to get in the bilge and inspect the inner parts of the boat. These boats are famous for hatches leaking over the fuel tanks. And once in the fuel tank compartment it really had no place to go. After pulling the tanks it is a total mess. Wet foam, rotted wood, and just needs to be completely redone.
My only question is what do you guys think is the best way to remedy these old stringers? Do i just pull these out? Or is there a better way to tackle this mess I have gotten into? The stringers are waterlogged. I will be redoing everything with coosa. Definitely don't want to use wood to replace them with. Suggestions? I want to do it right because I really enjoy this boat and it suits my needs perfect. Not to mention how capable it is for a 21 ft boat. i am not trying to cut cost on this build. I will be asking questions about other things but for now i am in the demolition phase. Cant believe how this thing is put together. It is built like a tank. Just wasn't the best materials used in 94 or how the drainage in the bilge is done. The pics are from on top of the stringer looking down at it. Its tight quarters there so to remove it it will have to be broken and chiseled out. Any help or suggestions would be greatly appreciated.
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Old 09-29-2017, 11:07 AM
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Old 09-29-2017, 02:35 PM
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Hey Rusty, there was a guy on here that did some good documentation on his thread about a 25' Seacat. It may provide some info to overcome similar hurdles you have. His screen name was Kirbyxxxx, with the x's filled with numbers. I will come back to this thread and let you know if I come across the thread or accurate screen name for the guy. He REALLY went through the boat. I'll try to find it for you.
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Old 09-29-2017, 02:41 PM
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Found it.


Is a 25ft sl5 Sea Cat worth a total rebuild ?
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Old 09-29-2017, 03:06 PM
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Thanks Mike, i like his thread and the other on here doing the 21. But not much info on the stringers.
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Old 09-29-2017, 06:21 PM
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Originally Posted by rustybroussard View Post
My only question is what do you guys think is the best way to remedy these old stringers? Do i just pull these out? Or is there a better way to tackle this mess I have gotten into? The stringers are waterlogged. I will be redoing everything with coosa. Definitely don't want to use wood to replace them with. Suggestions? . . . . Just wasn't the best materials used in 94 or how the drainage in the bilge is done. The pics are from on top of the stringer looking down at it. Its tight quarters there so to remove it it will have to be broken and chiseled out. Any help or suggestions would be greatly appreciated.
An oscillating multi tool would be perfect for that job. Use a flush cut saw blade to cut through the skin on each side. The rotted stringer should lift out, and you can use it to pattern the Coosa or other material stringer. Bed with thickened resin. I'd use epoxy for this. Then wrap with layers of 1708 to encapsulate ant tab into the hull.
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Old 09-29-2017, 06:52 PM
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Originally Posted by mshugg View Post
An oscillating multi tool would be perfect for that job. Use a flush cut saw blade to cut through the skin on each side. The rotted stringer should lift out, and you can use it to pattern the Coosa or other material stringer. Bed with thickened resin. I'd use epoxy for this. Then wrap with layers of 1708 to encapsulate ant tab into the hull.
Thanks I appreciate the info. It wont be hard to remove. Its so bad I can almost push it over with my feet. Whats wierd is the front 7 ft of the stringer is not wraped in glass. Only has a light layer of foam. Can step on it and it crumbles apart.
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Old 09-30-2017, 07:23 AM
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Keep us posted. Love rebuilds. And old cats are even more interesting. Too bad they over built it, prolly would have been a better performer if it was layed up lighter
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Old 09-30-2017, 09:01 AM
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Default lighter

it will go back much much lighter
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Old 09-30-2017, 12:04 PM
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Got it stripped down. Next is the stringers. What a job!!
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Old 09-30-2017, 04:28 PM
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did you make any progress on this rebuild? Any additional photos? Was there foam aft of the tanks? Thank you
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Old 09-30-2017, 05:11 PM
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I just started yesterday!! Not much foam behind the tank. the wost foam was all around the fuel tank enclsures. I will post more pics. if you noticed i also cut the fish box out of the front.
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Old 09-30-2017, 05:56 PM
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You may take a look at this one. It's not a cat, but study the pics, they show how and what. He went thru a similar stringer problem, and his approach is great. I wish I had this guy skills.

Flats boat rebuild
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Old 09-30-2017, 06:37 PM
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awesome read. thanks
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Old 10-01-2017, 12:50 PM
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Default cleaned out

Almost a dumpster full of wet and rotted crap.
Also remove one of the stringers.
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Old 10-01-2017, 02:13 PM
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That's amazing
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Old 10-01-2017, 02:34 PM
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Originally Posted by Fordy View Post
That's amazing
Aint it? Amazing how much weight I'm gonna lose. Im gonna have to reprop !!!!
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Old 10-01-2017, 05:24 PM
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Gonna be a nice boat when you're done. Everything will be just the way you like.
Will follow the build.
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Old 10-05-2017, 03:58 AM
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Wow great job so far! I am debating whether I should do this myself! I love the boat and new boats are so expensive nowadays. What is your plan for the tanks? How about the floor?

Are you going to use the same console?

Look forward to more pictures soon!
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Old 10-05-2017, 05:33 PM
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It's a job tearing it apart. Gonna b a bunch of work but I really enjoy this boat. I will use coosa on everything. I can get it locally. Moeller makes a tank that will fit in the same place as the old ones. They are 35 gallons instead of 40. But beings I have it gutted I can adapt a little larger tank. I'll post more pics as I move forward. I am going to probably cut about 6 inches off of the width of the console. It's a big console for a 21 ft boat.
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