Currently as the 5200 is curing in the through-bolts for my coosa transom, I shifted focus to the marine-grade ply template that I previously made, as part of my process for building the coosa transom. So, I had my ply template, which I had used to build the horse collar, which resulted in an exact piece missing from the ply template that matches my coosa horse collar. I trimmed the bottom and edges a little, voila the ply fits perfect inside the Z-bar framing and wraps around the horse collar perfectly to create a 1/2" Marine-Grade Ply layer to the transom that will be flush with the coosa horse collar.
I created this ply layer to mitigate the two main problems there are to working with coosa.
1. Touching coosa is like touching fiberglass insulation, so it would not be pleasant to work around and near in the cramped area of a transom.
2. It doesn't have the holding power that plywood has when you screw into it. It's a lot like king's starboard, easy to strip out, won't have the same bite if you back a screw in and out.
So, currently the 5200 is curing in my through-bolts on my transom and I am treating the plywood layer with the "Old Timer's Formula" (two parts mineral spirits, one part boiled linseed oil, one part Helmsman Polyurethane). I'm supposed to let that cure for 72 hours and then I have some white, oil-based Rustoleum brand machine paint I'm going paint over top. The white paint adds another layer of protection, but it also makes it easy later to find stuff that's mounted to the transom, everything on it will stick out like a sore thumb.
Later this week after the paint is cured, I'll install the Marine-Ply layer with about a half-dozen dozen 316 stainless lags, with very aggressive threading. They will easily be enough to hold it in place until things start getting mounted through it that will hold it, (i.e. tie down eyes, kicker motor mount, etc.)
And with this update, I think you're pretty much up to speed with me. I'll post pictures of everything when they get it fixed.
