I've covered several seats with neoprene. It looks more finished than the raw foam. I don't know that it improves comfort in any way. Comfort is more a factor of getting a good shape. A seat can be hard as a rock and comfortable as long as the shape is good.

I used contact cement. It is tricky and you need to do it one shot, but it is hard to beat for durability.

: Many threads here about carving seats from ethafoam, I've learned something
: new in each of them. The most recent mentioned a supplier, from whom I
: ordered a 2ft x 2ft block. Those guys suggested something I'd never heard
: of: covering the carved ethafoam with neoprene for cushioning and
: "grip." They recommended 3/8 inch neo, but I chickened out and
: ordered 1/8 inch, figuring it would conform to the contour better.

: 1) How do you like the upholstering idea? Is grip good? Seems like it might
: make it hard to lay back or squirm around if you need to. (The supplier is
: in Tennessee, probably more oriented to WW boats.)

: 2) Can you suggest an adhesive that would give me some working time to smooth
: out the fit (unlike contact cement).