CK80- I get the idea of starting in the middle and working out to the curved edges. But the wagon board is 8 ft long with a hump in the middle. How would you keep it going smoothly? I can get a helper. How do you apply the glue? Spray as you go? Videos show them spraying a large area, letting it dry a bit, spraying the foam side, dry, then wroking it into place. How would you work out evenly to the edges unless you glued a bit at a time? Spray a couple of inches the whole length? Then lay the fabric that few inches at a time?
8 feet isn't so much different than 5+ feet but I get what you're saying. Definitely easier with a helper, even at a 5+ footer.
For me, I used the 3m trim and spray adhesive that comes loaded in aerosol cans. So yes, I spray a section on the board, spray a section on the foam, it tack tries quickly, then mate the sections together. It was the process the can recommended. If you thought work times were short on the resin, you've seen nothing till the adhesive. Virtually no period to fix an 'oops'.
I did areas probably 6 inches deep by about 2 feet long at once. When I sprayed instead of ending in a straight 90* angle line I tapered at an angle towards the board.
Not: _________|---------------
More like ________/----------
Except angle wise much more gradual, more like 30*
Then as I went to spray the next section there weren't unglued pockets. Could you do the whole length? Probably. I'd be more comfortable doing short distances of 6-8 inches at a time whole board length with 2 people than 1. But I did mine alone and adapted.
You want some irony, once they tell me spend more time on my feet I'll probably try doing these thatve piled up over the years here. ... I've got a c10 that needs it (easy), a c10 that could use one instead of metal roof, (easy), 3 spare gbody boards that beg to be stabilized (lota of repair), and, an 87 suburban that NEEDS it (master class, lots of real-estate to cover on that bad boy.)