As far as pouring foam, it's easiest if you can adjust the angle of the boat while you're doing it. It will pour out with about the consistency of syrup before it starts to expand. I use separate two mixing cups so you only need two for the entire process, a cheap plastic pitcher to mix in and pour (cheaper the better, more flexible the easier to clean and reuse), a spatula to help distribute the foam and clean the pitcher and a drill with a mixer.
Some tips:
-start the pours on wide areas so you learn how much expansion there will be
-after about 30 minutes, you can pour over a prior pour
-don't foam yourself into corners. It will keep expanding and can cause ruptures. Try to leave large openings on prior pours when you're getting close to a corner.
-you can't have too many or too big of relief holes when pouring foam
I just finished foaming my 23 last week, and it took about 6 gallons mixed to fill the stringers. I mixed one quart (16 oz A + B) at a time and did 3 pours on each side, then waited about 30 minutes, cleaned my pitchers, mixer and spatula and started again. Once I got near the end, I started mixing smaller batches to limit pour over.
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