I got one recently to quilt a dark quilt (the outer part of my avatar). I got the white. Now I made my own template so the slots are rather wide :lol: I do really like the pounce. You have to practice a little to get enough powder out and smooth it around, but it is great! It does stay in place fairly well, but if you wad it up or rub it much, it WILL disperse. So I try to quilt all I mark at the same time. And any leftover washed right out.
If you are concerned about it coming out, maybe try it on a scrap piece of light fabric. Good luck!