searching the memory banks.......
ones i remember that were used include:
shredded newspaper....not pretty but affective, goes away fast
plantago binder (psyllium fiber mulch)
kellog's brand topper mix innoculent...tended to plug spray hose but extremely affective as a sticking agent and provided excellent germination substrate.
dozer cleats were a big plus....do you have a friend or good contractor that wouldnt mind tracking around for half a day?
at least get bids from potential hydroseed contractors and use the activity to pick their brains. there are a variety of additives that can be used alone or in conjunction w/ each other.
see some hydroseed pics here:
http://www.pondboss.com/forums/ubbthreads.php?ubb=showflat&Number=132309#Post132309
