Full resto underway-Just a few concerns (pics inside).

[TV Shooter]

So, a few questions for you enlightened fiberglass wizards.

I recently started work on my 1976 Mark Twain 160t. I purchased her at the end of last summer. I knew the transom was soft and needed help, but I assumed the stringers were solid because the floor FELT solid and the boat looks practically NEW.

When I ripped up the old carpet, I noticed that the holes used to pour the foam through the floor were left uncovered and there was water squishing up through them when I walked around on the deck. :grumpy:

After some head bashing, I cut up the deck and started de-foaming. Turns out some mouth breather had lifted the deck and epoxied/glued bare 1x1 lumber to the foam adjacent to the stringers at some point in the past, too.

My questions:

The foam next to the hull was saturated. When I scrape it up, it takes what appears to be the top layer of resin with it. Is this normal? (The hull is solid as a rock, I can stand on the newly uncovered bottom with no deflection.)

Should I do a layer of CSM or 1708 over the entire affected hull bottom, or can I go over it with a layer of poly resin once I clean it up?

Could the foam possibly have reacted with the resin when it was poured, and caused the delamination?

Thanks in advance.

 

[azmav]

Re: Full resto underway-Just a few concerns (pics inside).

Hard to tell the exact spot where that piece came from by the pictures but first guess, sounds like part of the layup for a stringer or other area that has come loose as the area disintegrated. You would certainly not be the first, check out Friscoboaters youtube videos and forum posts, pictures. Doubtful that the hull delaminated only partially and yet is still solid. More pictures showing where these pieces are coming from will help, or explanation. Welcome aboard!

 

[TV Shooter]

Re: Full resto underway-Just a few concerns (pics inside).

Hard to tell the exact spot where that piece came from by the pictures but first guess, sounds like part of the layup for a stringer or other area that has come loose as the area disintegrated. You would certainly not be the first, check out Friscoboaters youtube videos and forum posts, pictures. Doubtful that the hull delaminated only partially and yet is still solid. More pictures showing where these pieces are coming from will help, or explanation. Welcome aboard!

Thanks!

Let me try to clarify the pictures a little.

This is a piece of what I'm getting when I scrape the last layer of foam up (the layer that is in contact with the hull bottom).


This is a close-up of a recently scraped area, showing some glass coming off with the foam.

Here's a shot of the deck area to orient yourself a bit.


I've watched Frisco Boater's videos in their entirety and read almost all of the completed resto threads, so I feel good going forward. It's nice to have some extra eyes watching as you go along, though. I'll be making a full resto thread shortly.

 

[Woodonglass]

Re: Full resto underway-Just a few concerns (pics inside).

Get all the foam out and the hull cleaned up and let us take a look at the glass hull then. We'll be able to advise you better then.

 

[TV Shooter]

Re: Full resto underway-Just a few concerns (pics inside).

Get all the foam out and the hull cleaned up and let us take a look at the glass hull then. We'll be able to advise you better then.

Will do. Just need the NJ weather to start cooperating.

 

[GT1000000]

Re: Full resto underway-Just a few concerns (pics inside).

Hi and welcome to the Iboats.com dry dock, TV Shooter...

My best guess from this picture you posted...

Is that the last layer of either chopper gun mat that was sprayed in, or CSM mat that was laid, was not properly saturated with resin...
When the expanding foam sets up, it basically 'glues' itself to anything it is in contact with...
When you pulled up the remaining foam, the improperly applied matting delaminated and came up...

Like "Woodonglass" said, clean everything out and get it ready for put back, and we'll be better able to tell you how to deal with it...

BTW, poly resin, by itself is practically useless with out some sort of matting or cloth...without them, when it dries it is as brittle as glass...

You don't need to start another thread for your restoration as this one will work just fine and keep from getting things confusing...

Best of Luck and have Fun!
GT1M

 

[Grub54891]

Re: Full resto underway-Just a few concerns (pics inside).

Looks like my larson project,I had some areas that did that also. I belive they sprayed chopped glass to the hull and stringers insted of laying in sheets.I ended up grinding everything out down to the skin. Then layed up sheets to stiffen her back up. I had deflection at that point too but once I carefully supported the hull,and laid in the stringers its solid.
Attached is a pic of partial layup and stringers.
I'll pop the cap once the deck is solid and finish the area under the helm/seating area.

 

[Grub54891]

Re: Full resto underway-Just a few concerns (pics inside).

Double post