l used the wrong amount of hardener in the epoxy that l used on the hull of a plywood boat. It has been two weeks and the resin still is not dry on the fiberglass tape. can l just mix some more epoxy ( this time with the right amount of hardener ) and cover over the the entire hull?

yes, if you put the next layer on while the previous layer is still tacky, you will get good adhesion. Once you cover over that uncured resin, it will cure.

no air pockets, yada yada yada.

Hate to disagree with jtexas, we usually are in sync, but in my experience, if you go over uncured resin, you may not get a good bond to the original surface. I'd scrape and clean off the old with acetone, reprep the surface, and start again.

No.
Sorry, but you are asking for big problems if you do that.
Remove as much of the failed application as you can before you proceed.
Again, sorry, but that is the facts.

It is very iffy, I've tried it a few times, but I'd not recommend it, unless there is just no other way. Sorry Tex I've got to go with Jim on this one. P.S. In my other life, l am an expert in Plural
Component Materials, like urethane is and epoxies.

as ( amongst other things) l am a builder of sailboats, & have mixed & spread A LOT of epoxy in my life

No.

All u will do is have a mix of epoxy that is still under catalyzed;

( 4+1 + 4 + .5 does not equal 8+2. as an example;)

after two weeks u have a chemical reaction that has produced SOMETHING, but not epoxy; scrape it off & then rub off the remainder with acetone, denatured alcohol or toluene, WEARING GLOVES AND BEING PARANOID ABOUT FIRE; then wash the alcohol residue off with soap & water, rinse & then try again.

We've all done this 'just how much catalyst DID l put in there?'' space out at least once in our lives