However, the old seat foam is worn out. Sacked, flattened, and kaput. It's all there and undamaged, but after very few minutes, my hip bones are resting on the metal seat pan. And that ain't too comfy. I need to sculpt a new front section for my seat -- I don't want to change the shape, but I do need to renew the foam with something more dense.
I'm thinking the best approach would be to shave off the top layer of the old foam to preserve the correct profile, then replace everything belowwith new high density foam.
Does anyone know anything about the type or density of the foam needed and where I can find it?
I've seen mentions of using layers of foam rebond, as used in carpet padding. This is easily available and is firm enough.
The blocks of foam I can find locally are intended for couch cushions and are way too soft. I've also considered buying a couple of those foam stadium seats and using the firm closed cell latex foam. However, that stuff supposedly deteriorates too quickly.

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