I can't seem to get the basting with the la on the sides, how do you do that it seems my quilt gets bunched up a little I can just pin it but thought the spray would be easier

Are you sewing a straight line across the quilt top when you start...once you have a straight line your sides should be straight and shouldn't bunch...unless the borders are wavy...ease in the sides, basting as you go and it should work out...I use painters tape on the roller to mark the edge of the top so when I roll it lines up with the tape and I don't go crooked...hope this makes sense...

It is tough basting on my quilter also. I used to pin, now I spot spray with basting spray. Spray a little dot in several places and then press down and arrange. It doesn't gum the needle. I use Aileen's? I think.

You are right. Basting spray takes the place of pins and won't hurt your machine. I know some quilters like to baste the sides of their quilts, but I haven't needed to do that so far.

Personally, I would not recommend using spray basting with a longarm machine. Not that it would do any harm, but that it might cause some puckering as you quilt. I much prefer stitch basting along the edges as I advance the sandwich, gives me some wiggle room to keep everything nice and pucker free.

I am thinking it would be just spot spaying I do not have needle up needle down on my machine

I have never used basting spray on my longarm. I don't see the need for it.