1970 Flatback 222 - Barn find Revival

[Ulysses485]

Rickk, I actually started off with chopped strand matt to fill the 20'' transom void and then another full layer of 3/4oz matt over the whole transom before I started laying the rest. The 3610 is a 0/90 25'' roll that is indeed heavy stuff but I have gotten use to using it and wetting it out properly. Takes a lot of time, finesse, and A LOT of resin. Nearly the entire inside bottom of my 240cc got a layer of it so I have had my fair share of fight with it. The 2408 is basically the same as 1708 but a little heavier and I used a 12.5'' roll. I have to taper the edges of the few lap sections and I may or may not add another layer or two of 1708 for good measure. I have a 60” 240lb roll of 1708 that I plan to use for decks. I would have never bought such a large roll if I knew what I know now. Managing shorter /lighter rolls for me is much more doable.

I may just add biaxial glass to both sides of the 1.5'' coosa on a table but I haven't decided yet. I was over exhausted when I was done with this at 2am that evening and couldn't go further but still ended up with 1/4”. I’m considering using a vinyl-ester based core bond in pails so I can also use it for coring the hullsides.

Question: how many gallons of resin or bonding agent do people typically use the bed in the core? I was thinking a gallon would be plenty but guess I should do some sf calculations.

[Duffy1470]

I will also be interested in gallons / Sq ft for core. Ulysses, I didn't realize you were in the middle of a build. Don't know how I missed that.  Looks awesome.

[Ulysses485]

I think I figured it out based on flooring material spread through a trowel. I have a bunch builds going on. The links are all in my signature below.

[Ulysses485]

Looks like a 1/4'' x 1/4'' trowel will spread a gallon over 32SF so using the 1/4'' x 3/16'' trowel that I have, a 1/2 gallon of "peanut butter" should suffice to bed the coosa. Probably get 4 quarts ready to be on the safe side. I'm thinking of laying up 2 layers of 1708 on coosa (both sides) a few days prior. A layer or two of matt on the exterior skin to go wet on wet with the 1/4'' layer of "peanut butter" troweled on the Coosa. Id much rather overbuild than under build.

[Ulysses485]

Got the transoms skinned with 2 layers of 1708 on the inside where the the core will meet the outer skin. Trimmed and ready for Arjay 4001 Corebond. Note: These are two (2) 1.5'' transoms for two (2) different builds. See signature for other rebuilds

[Duffy1470]

Super cool. Used the chart you posted last night. That is by far the best thing I have gotten off the internet. Thank you again.

[Ulysses485]

  I’m glad it helps. Not sure why I didn’t think to post it sooner in my threads. I don’t think it’s a “manufacturer secret” but I’ll give the credit where credit is due and that is Mirage Manufacturing in Gainesville, Fl. I bought most of my materials from them since 2019. Only recently have I started using a more local supplier because I changed jobs and their pricing is also more competitive. The first thing I do before layups and catalyze my resin is reference this chart.

[Ulysses485]

Did a quick test fit for my DIY 2x4 clamps. Should do the trick!


Decided to put a tape line on the inside where the core bond will eventually ooze out. I marked just outside the coosa when it was set in place with magic marker. This should help me from having too much cleanup after I create a radius to the inside corners. Once I get the radius completed I can pull the tape for no cleanup...at least that's the plan. We will see how it goes.

[RickK]

Nice clean work Ulysses