ORIGINAL: YellowBlueBird
Didn't Gorisich mean to feather with spackling to get rid of ridges after smoothing the epoxy with sand paper? The fiber glass is to give the center section added strength and with the errors so far this wing needs all the help it can get.
Jerry
Curious...on a trainer why do you want to use 3 layers of glass?? These are lightly loaded and powered. One layer of 2-3 oz will be plenty even for a 60 size. Finishing epoxy works great for this.
If you do decide to layer it, it doesn't make a hill o' beans difference which width you lay down first. Final strength will be the same. So I suggest you go for the one that's easiest to finish
I'd use 2 layers tho. If you want to get a little more out of joint (I don't know why you would, but anyway...), lay down one of the layers on bias and the other orthogonally. That is, cut one layer of cloth at a 45 degree angle and the other at right angle. You get max torsional strength this way and you maximize tear strength in the center joint.
Again, for a trainer don't bother with any of that tho. How much strength do you think you really need for a 5-8 lb airplane with maybe 700-800 sq in wing
AS ALWAYS, YMMV...