Sounds ridiculous, i know. But if we were allowed to glue sandpaper onto the face of the say, 7i, would that greatly increase the spin rate of the ball? Makes sense to me as then the grip of the grit would keep the ball on the face longer and provide more time for 'compression/deformation' and increase the spinning.
Why ask? Well, i checked out Stadler's irons and he uses Cleveland forged with some kind of special microgrooves cut between the deep grooves. And Cleveland claims more spin. And Mark Crossfield tested these clubs on his machine and YES, found more spin, compared to normal irons. So i'm thinking a thin layer of epoxy sprinkled with diamond dust on my irons. Watch me spin!!