Worked Fine For Me

I've used them a couple times and they worked fine for me.  They are a bit flimsy though, so I stapled a length of 1x1 wood along their tops.  That made them much easier to handle.  Tip: hold them a bit off the surface when you're spray painting clouds so that you get a softer "border".

Very nice

I really like how those clouds turned out, Jack.

I'll have to try that technique sometime!