1987 Larson DC-215 restoration

[sms986]

Back to building!
i got in town this evening and spent the night cleaning up/making finishing touches on the transom slabs. Tomorrow I will begin the process of laminating and attaching the slabs together. I have three questions:

1. When I laminate the wood, how long should I wait before I can start assembling them? I know its around 24-72 hours for the resin to cure, but if I am using more resin to glue them together, Do I have to wait that long?

2. When I glue them together, I'm going to use a sheet of 1708 between each piece (3 total), then one on the back of the total assembly. Does it matter that the 1708 has chopped strand on the back and biax on the front or will I still get a good wood bond on either side?

Last, I have a few spots where the transom pieces don't line up exactly. At most, they are 1/4" off. The whole top is perfect between the three as well as the keyhole. Would it be a bad idea to mix up some PB and go over those spots before installing to smooth them out?

Thanks!

 

[kcassells]

Unable to reply tried 3x

 

[kcassells]

The previous just went thru but again 4th time not my comments to your questions.

 

[kcassells]

Let's try this way?

Matt is always on the wood.
Wet out your wood. Let it get tacky. Come back and wet out again. Then apply 1708 matt side down.
Can clamp or screw parts at this time or next day. Male sure edges are wetted out and voids filled.
After 1708 is gone order 1700 biax.
Any time you can seal a gap that's good beatin off water and air bubbles stuff.

 

[sms986]

That's what I'm wondering. I have 3 plywood pieces that make up my transom, so I'll be attaching them wood to wood. Is it better to get a sheet of mat to put in between them, or can I still use the 1708 with decent results?

 

[kcassells]

You are using EEEpppoooxxxyyy so 1708 is fine. Matt alone has no inherent strength.

 

[dezmond]

No Matt with epoxy. Why don’t you just get Titebond 3 and glue them all together? To me you would be wasting resin and materials if you put that in between each plywood layer. Titebond 3 is more than strong enough. Coat each sheet of plywood with just resin and all the sides. Let it dry. Grab some warm water and a scrub pad and clean the anime blush off, quick sand to scuff then slather on the glue and either clamp or screw them all together with stainless screws. Save your resin for tabbing and the final layers on the inside of your transom. 72 hours later and your ready to install the transom. This also gives you some time to plan and make your clamps to hold the transom in when you use PB.

Just my thought on this one.

 

[kcassells]

No Matt with epoxy. Why don’t you just get Titebond 3 and glue them all together? To me you would be wasting resin and materials if you put that in between each plywood layer. Titebond 3 is more than strong enough. Coat each sheet of plywood with just resin and all the sides. Let it dry. Grab some warm water and a scrub pad and clean the anime blush off, quick sand to scuff then slather on the glue and either clamp or screw them all together with stainless screws. Save your resin for tabbing and the final layers on the inside of your transom. 72 hours later and your ready to install the transom. This also gives you some time to plan and make your clamps to hold the transom in when you use PB.

Just my thought on this one.

Dez,
He bought some 1708 before he understood not needed. He's swapping over to 1700 after it's used up.

 

[dezmond]

Gotcha. Wouldn’t it still be better to glue everything together and save the 1708 for the inside layups of the transom. I was trying to save him $$$$ on all that resin he would use in between layers of ply. That’s all .

 

[kcassells]

I guess it's a preference. Tite bond has a gas off time? I forget.
It's overkill but I did it that way too.

 

[sms986]

I'm taking this route because I need to add some thickness. The outer transom skin is 1/8" thick. I have 2x1/2" plywood slabs followed by 1x3/4". That gives me 1 7/8" total. There are other ways of adding thickness, but I thought 1 layer of 1708 on the outer skin followed by the 3 plywood slabs with 1708 in between plus one layer of 1708 as an inner skin will get me in the range.

I do want to be clear on this before I begin building though: 1708 and epoxy is not a death sentence for the boat, right? From what I understand, it's just unnecessarily thick and the mat side is not required.

 

[kcassells]

CORRECTO! Nasa...we are good to go.

 

[kcassells]

I was thinkin back on my project....so long ago lol!
I did glass the plywood and when I put them together I used pb for the bond.

 

[kcassells]

https://forums.iboats.com/forum/boa...lamingo-splashed-w-pics?p=5550980#post5550980

 

[JASinIL2006]

Personally, I'd rather get a really good wood-to-wood bond (e.g., with PB or Titebond III) and use glass on the outside to build up thickness. Not saying a layer of glass between wood slabs is bad, but rather do all the glassing at once.

 

[sms986]

I've decided to bond them with PB. I just got all three slabs laminated this morning, and they look good! Hopefully I'll be able to glue it together tomorrow morning.

Do you guys think a 1/8" thick outer skin is ok, or should I build it up a bit? If so, with what? I'm ok with getting some more glass.

 

[sms986]

So I just got home and checked my transom. It turned out...horrible. I don't understand what happened. It seems like the PB expanded against the clamps I used and separated the wood when drying. I used 2x4's across the beam of the transom, then clamped them together with 4 steel clamping rigs that slide over the transom (front and back faces) and clamp down on the end. I even checked the steel beams to make sure they weren't flexing. Once clamped down, I cleaned up all of the squeezed out PB around the edges and let it sit to cure. Got home and it's like the PB receeded from the edges and expanded in the middle areas, pushing the plywood sheets apart. I've attached some pictures. Anything that can be done about this shy of scrapping it and starting over?

 

[oldrem]

Mine ended up a bit too thick to fit in the channel on my tinny, so I ran it through a planer to get it down to size.

 

[sms986]

I'm not too concerned with the thickness...it's pretty consistent all the way around-to within 1/32 of an inch. I'm concerned with the air pockets throughout....

 

[oldrem]

I think you should be ok then as long as all edges are sealed and it is fully encapsulated in resin / glass ??