I would like to know whether eight toggle bolts (such as the one from
FASCO Fastener) are strong enough for bolting down a seat (like a
seat/cooler combo unit). Currently, the seat is only screwed into the
core material of my deck and the core material is totally rottened. I
will add epoxy bedding to strengthen the fasteners area of the deck,
and I want to use bolts instead of screws to secure the seat. The
problem is that there is no access to the underside of the deck where
the seat is (the boat is a small 18-ft power boat). And I cannot get
my hand into that area through a nearby inspection hole because there
is a structure frame blocking my way. I am wondering if the
toggle-bolts are a good way to secure the seat in my situation.

But I normally don't use toggle bolts for anything other than hanging
pictures, towel bars that sort of things. I am not sure if toggle
bolts are strong enough to secure a seat. I saw someone used toggle
bars in a boating TV show; but that was for securing a battery, not
anything too heavy. I am wondering if this is a good choice...

Thanks in advance for any info.

Jay Chan