It is good to think (outside the box), but I am wondering what paint you used that failed? Queens have been successfully marked for years with paint. Now days it couldn't be easier, simpler, or faster than now, using the one handed queen catcher. But if you prefer to go about in your new way, wouldn't the silicone dry (flat) and not contour to the thorax? Wouldn't this be almost impossible to keep glued down as the dry flexible silicone will (remember) its dried shape and (desire) to go back to that flat shape, always trying to lift from the new glued shape of the queens thorax? You may have already overcome this and all is working just as you have planned? If so congratulations with your experiment! And if so, why not add the color, mix, the color in the clear silicone, that you desire, before doting the silicone on the base sheet to dry? They way your dot will be based with the color through out? Would a cheap teflon cookie sheet work better than aluminum foil? Best of luck to you . Keep us updated. Thanks, Phillip Hall