I use a 14 for piecing but when it comes to the quilting and binding (with walking foot) I was told to use a 16. My thinking is usually backwards but after my last quilt using a 16, I had to ask.

I alternated between 2 colors on my binding so every 5" when I'd hit a seam my machine would 'scream at me-kinda like the needle was hitting a solid surface. The needle would go through but not without a fight.

So, what size needle? Thanks.

I use much smaller needles for piecing and the binding, an 80/11, quilting maybe a 90/14.
If you cut your binding seams on a 45 degree angle when you sew them together it will cut way down on the bulk and will be easier to sew through.

I use a 70, 75, or 80 for piecing. Probably an 80 or 90 for the binding.

The only time I would use a 16 would be for Canvas or Denim.

A needle that is bent, dull, or has a "hook" on it will also act up.

Also very good advice -

Another thing I learned the hard way was to change the needle at least every week, especially if you sew a lot. Some experts recommend a new needle every 8 sewing hours. This will keep you sewing with a sharper needle, and less trouble. :)

don't forget to consider the weight of your thread when choosing a needle size. if you're using thread made especially for quilting or for topstitching you may need a size 90/14 or 100/16 needle.

Thank you for the tips, I had that problem with quilting one of my quilts, the needle would not go down very easily, even though I used a 100/16 needle!
It might've been the backing, I used a sheet..

I usually use Coat's and Clark double duty (the cotton and polyester one - gasp) and the smallest (finest/thinnest) needle I can that won't break when I sew.

I just checked my 10 year old couch quilts - there is no problem along the stitching lines from using that thread - the bindings are starting to fray a bit from use, but other than that, looking good.