I think the problem you'll have is finding a flexible enough spreader that CA won't stick to. There aren't many materials it won't bond to, even fewer that will conform to the contours of a guitar body.
Maybe if you heated a regular plastic spreader then moulded it around the edge of the body or something with a similar radius ?
I'd suggest using a gel based CA rather than the low viscosity ones, and one with a longer cure time. Work on a small area at a time.
But most importantly, try it on some scrap first, no point wrecking a decent body for the sake of some cheap CA.
Now if you could spray it.............
Don't even attempt this ^^ it's unbelievably dangerous !!!