Starting a 1974 Tri-Hull Restoration, it's a Stryker Mark IV model. Need help with any information or an owners manual.

[MikeSchinlaub]

I'm just coating the plywood underneath that'll be touching the stringers with flex seal

That's even worse. The rubber will just trap moisture against the wood and make it rot faster. Do a layer of csm on the bottom of the floor and that will give you plenty of water protection. Or at least as much as all of the other wood anyway.

Kept well it will last 20 years or more.

 

[Scott Danforth]

see the links posted in post #6

 

[Pvaughan23]

I really appreciate all the help and advice I've been given, and I will definitely need some time first to gather up the materials needed to actually start working on it. But I've got the raptor Lining, working on getting the Fiberglass & Resin for the repairs around the trim, then it'll be onto the flooring and such. While I foresee it maybe going to at least 5k for everything I need to do, it definitely won't take me too long to get it all done. I'm already about 1k in between the first few materials, and getting the boat/trailer with the titles. I'll still keep it updated when I can, but it might be about a month or less before I'm actually starting on it

 

[todhunter]

The flex seal and raptor lining is a bad idea. It won't soak into the plywood and adhere well. Do it right - buy some polyester resin, coat every side of the wood in resin, then encapsulate the plywood in a layer of CSM. The materials aren't that expensive (I recommend shopping at US Composites). Save the flex seal and raptor lining for another non-boat project, or sell it, or just eat the cost. If you plan on keeping the boat as long as you say, future-you will be cussing current you when you're having to replace a soft floor again in a few years.

I think a lot of people try to initially avoid polyester because it's the fear of the unknown (not saying that's your case, but maybe?). It's really a very forgiving material, and I was afraid of working with it at first too. This is the right place to be to ask questions on how to use it. It's really a great material, and the right material to use.

 

[Pvaughan23]

I've revised the plan, the fiberglass is coming in, and when it does I'll put up some pictures of the Transom because I feel like there's supposed to be a bit more of a connection with the cap and just need to figure out at least a baseline to go off of with the new fiberglass and resin.