I didn't have any problem with them, just make sure when you submerge them you have 'em taped to the shaft on one end or the other or they'll slide a bit and you'll end up with the fletching varying between arrows maybe .125-.25" up or down the shaft.
I noticed that on my first half dozen arrows I did this way. Like I said, I didn't have any problem with the way they shot because of it, but it just looked tacky lol.