1st post, looking for advice

[scook]

This isn't my area of expertise but a couple of thoughts come to mind. I've spread some floor covering adhesive and some thinset mortar with a notched trowel (like Smoke suggested) - it goes plenty fast, just be SURE you have enough mixed up to do the whole job. I can't imagine it taking you 5 minutes to do the spread. You might put some duct tape over the under side of the holes you've drilled in the plywood so you don't have to be careful about working around them spreading the resin and so it's not dropping in your armpits while you're initially getting it in place.