90 Larson Senza Spectre total rebuild and restoration

[Woodonglass]

Mutiple layers will, in the end, be stronger than one layer. However it will be more costly since you'll end up using a bit more epoxy. Different layups call for different approaches. IMHO buying the you need both. Not sure where the confusion is. One fabric does NOT fit all circumstances.

 

[Spectre250]

Different layups call for different approaches. IMHO buying the you need both. Not sure where the confusion is. One fabric does NOT fit all circumstances.

That is where my confusion lies. I know what is needed for polyester, but epoxy has me all dumbfounded (never fiberglassed before in my life so work with me here lol). So glassing in the stringers and transom and deck, Ill need 17oz biax cloth (no mat); I dont see where 6-8 oz cloth would be used ?? To go over the 17oz to hide the weave and add another layer of support?

I guess I have alot more research to do before I start buying...

 

[Spectre250]

Heres the pictures I said I'd upload:

First is the bare transom in all her glory, still need to remove a tiny bit at the bottom, but shes ready for grinding.

Now for the cabin interior parts, only removed port side boxes because that was all that was rotted, plus the false floor was rotted a little bit but I removed it all to start fresh. Starboard side is fine surprisingly, and everything forward of that is perfectly dry and solid (Thank God!) I also removed the main bulkhead that separated the cabin from the outside and tried my best to keep all the starboard side boxes intact..... nothing a little epoxy and glass cant fix .

Started grinding the inside hull areas and making my way backwards. Theres a little spot of rot on bottom of cabin stringer that Im just going to cut out and shove in a new piece of wood and epoxy and glass over like normal. What a total mess this has become!!!! hahahahahaha. That tyvec suit was painfully hot and sweaty! You can see the joy on my face and on the dusty hull :facepalm:uke:

 

[alldodge]

Yep Tyvek is a love hate relationship, I also used a full face mask when doing mine. The job is coming along good

 

[pckeen]

You are making great progress. Looking much cleaner.

 

[Woodonglass]

duplicate post

 

[Woodonglass]

Duplicate Post

 

[Woodonglass]

Well I posted some info on your fabric selections and it posted it 3 times. It WAS there and now it's gone!!! All that's left is when I edited the duplicate posts
Lets try this again.
When using epoxy, I'd recommend this layup schedule...
Transom 2 full layers of 17 oz first one extending 6" onto Hull sides and bottom Final layer extending 10"
Stringers 2 layers of 17oz first one starting 1/2 way up the stringer and 3" onto hull last one All the way to the tops of the stringers and 6" onto the hull.
Deck Tab it to the hull sides with 8" strips of 17oz fabric. 4" on deck, 4" up the sides of the hull. A finish layer of. 6oz fabric on top of deck and up the sides to hide the 17oz and add a bit more strength.

Some people like to put a final layer of 6oz on the transom to hide the 17oz. Totally up to you.
Bottom of plywood decking just gets 2 coats of epoxy...No Glass needed.

Hope this helps!!!

 

[Spectre250]

Thank you thank you thank you!!!!!! That is exactly what I needed to know!
As far as capping the stringers, Im going to be adding a 2X2 piece of wood at the top of stringer to attach the deck; once thats on, should I add a layer of 6oz over the top of the stringer to hold it all in place?
And for the deck, only one layer of 17oz tabbing and a layer of 6oz overall will be sufficient? Also, what if I wanted to add a layer of 6oz underneath the deck, just so I feel better about it being totally sealed. Would there be any drawback to doing this besides using more material?

 

[Woodonglass]

The Glass does NOT aid in waterproofing the wood. Epoxy has it's own "Binders" in the mix and therefore will not crack or break when flexed. Poly NEEDS glass to keep it from cracking. As long as the epoxy coating isn't artificially breached the wood will be permanently sealed from moisture. Adding fabric only increases the structural strength Not saying you can't but I wouldn't. The deck ONLY needs 6oz fabric on the large flat areas. The 17oz is ONLY needed to attach the deck to the hull sides as I previously explained. 5-6 yds of 6oz will do the entire topside of the deck. Add 2 More for the Transom Everything else is17oz 10yds of 17oz should do the Transom Stringers and Tabbings for the deck. 5-10 gallons of epoxy should get you close to the finish.

 

[Spectre250]

You sir, are a saint. God bless you! I mean it. I was about to order 60 yards of 17oz lol....

What about capping the stringers? 6oz or 17oz?

 

[Spectre250]

Hello everyone, have some updates. After three straight days of grinding, Im finally done! Minus the lip for the deck, of course. I wish to never do that ever again!!!!! I must have lost ten pounds sweating in that darn tyvec suit! What a horrible experience haha.

I got her all washed out and am gonna let her dry over the next few days. Do I need to degrease and scrub the hull? Or is the hose sufficient?

My supplies should be here on wednesday so thats exciting! All I need to do now is buy some wood and i can start glassing her back together. Still need to remove the junk sitting in the v berth, and remove all the carpeting from there as well, its old and falling down and has mildew stains, not to mention extremely dusty! This has been quite the adventure so far......

Happy fathers day to all the dads here!

 

[alldodge]

IMO your good, even more so with using epoxy resin.

 

[pckeen]

Love seeing these boats all cleaned out - nice work.

 

[Spectre250]

Thanks guys, I cant wait to start putting her back together!

 

[fractalphreak]

Spectre250 your prep work looks amazing. I'm curious, what is the rounded transverse raised area in the bottom of the hull? it looks like its about 5 feet in front of the transducer. In your photos I see what looks like a drain in the front but not the back...??

 

[Woodonglass]

I'd advise wiping all the areas to be glass with a rag soaked in Acetone prior to laying any glass. This will ensure all contaminates are gone and give you the best possible bond.

 

[Spectre250]

Fractalphreak- Thank you! That is the stepped hull you are seeing. And there are two drains, one mid ship (because of step) and one aft at transom

Wood- I plan on wiping with acetone right before I start laying down glass, just wondering if any other type of washing was needed before the acetone

 

[Woodonglass]

Wood- I plan on wiping with acetone right before I start laying down glass, just wondering if any other type of washing was needed before the acetone

If you really want to make sure then mix up some TSP(Tri-Sodium-Phosphate) per box instructions and wash her down with it. Then do the Acetone wash.

 

[Spectre250]

I got my supplies yesterday!!!!!!! One question before I begin though, do I need to add little chopped strands of glass to my thickened epoxy??? I know with poly you do but im unsure about epoxy. Also, Im putting two pieces of 3/4 together to make up the transom, should I glue the pieces together with thickened epoxy or PL glue?