SS will solve the rust issue, but we have 7
cheap automotive struts on our
boat operating various lids and hatches and have not seen a spot of rust on them in 18yrs. Granted, they are inside applications (but two are fridge and
freezer, so they see moisture). Replacement is always because they gradually lose their
lift force over 5-8 years or so. I have had many of those spring things and no way would I use them anymore - way too many cracked skulls from accidentally bumping them.
If they do rust in 3 years or so, just replace them. These things only cost $10 if you stay away from the
marine stores.
Mark