Hi, sorry for a pretty damn slow reply.. please forgive me :-)
I´m always around, but not always physically... anyway, often I wet form the seat, then take it off for tooling the seat, and then form it back after finished.. but sometimes I´m tooling the seat after it´s attached, but mostly only for touch up..tooling on a soft padding is not recommended, at least not from my experience. Hope this helps :-) Feel free to ask, and I´ll try to get back to you within a couple of years.. no seriously asap :-)