Why?
Do you keep tearing up the aluminum. If so - on what.

The comp prop will work but will not have the performance of your aluminum
which is even less than the SS prop.
If your needing more hole shot/acceleration or more top end go w/ the SS.
If your hitting little trash and or sand/mud bottom go w/ SS as it will not
tear up (and it won't tear up the lower unit as some poeple will say as it
has a rubber or plastic hub that will give way long before the SS gears and
prop shaft).
If you hitting rocks and stumps - stop as your going to tear up more than
the prop one of these times.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"Gregory McGuire" wrote in message
...
I have a dent in my prop, and posted to newgroup but post was deleted.
anyway I currently have an aluminum prop and am interested in one of the
composite (plastic) props for my 90 horse mercury.

Has anybody used a composite prop yet or have any advise if I should get
one
?