Bob, I found that the spacing of the holes for my recess anchors was dictated by the material I used to thread through the deck and then epoxy in. If I used stiffer tubing (poly) it would not create a short radius and the spacing was around 1.5”.
Lately I have been using very large diameter “O” ring (section of ¼” ) that is a bit stretchy; it makes easier removal when resin has cured.
Make sure that you really grease up well that rubber (or other material) used for the mould or it will stick to the epoxy.
I use epoxy mix (West System) with microfiber and some micro-balloons to the consistency of firm peanut butter so I can work it well around the tube and still have it firm enough so it won’t drip/sag before curing.
I even tint the epoxy to match the color of the deck for a “professional” look. My way of doing the anchors is however limited to where you can get your hand to as locations right of the end of the bow/stern might require working with a stick (hard to get push the epoxy paste around the “O” ring section).
Paddler's Truck Rack
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