Just read another post about steaming the old foam. I'll try that too. quote]
hmm...never heard of that, what does steaming olf foam do?
When I fixed up my seats i replaced all the old foam with varing dendity closed-cell foam too make them both firm, but comfortable. Seats that feel too soft when you just sit on them may bottom out when you ride in them! Good, closed-cell foam does the trick.
I was lucky (so far) enough to be able to re-use the current vinyl and just replace the foam and re-staple. I may have to do a few with new vinyl, or at least vinyl "borrowed" from other partsof the boat not being re-used.
Good luck.