I saw in one of your posts a reccomendation to make a paper shield to protect your hoops.  I suggest the Hoop Shield it has been out for some time and is so handy to use and clean.
It comes in four sizes and fits most all machine hoops except the Bernina. And they are addressing that issue now. Protect your exspensive embroidery hoops from tacky adhesive spray.No more ugly sticky hoops and no more spending time cleaning the edges and grooves. Protect your embroidery hoops from tacky adhesive overspray .  The Hoop Shield was specifically designed matching hoops sizes of the most popular model embroidery machine hoops. The size and clear view allows ease in positioning over your hoop frame before spraying.  see www.econceptmall.com