is it necessary to grind this out ?

where the fiberglass has cracked around the old keel, the rotten wood stain has seeped into the layers of glass. I seem to be grinding a lot of thickness out. Should I just keep grinding this until it's back to a good clean surface, or take into account that the hull is 32 years old, and not be as fussy? You will see in the photo the black stain.
if you click on the photo it's easer to see.

 

Depends on how far you can swim! If the glass is sound then fine leave it but if there is some kind of a inter- laminar problem or with the old resin and water has been somehow leeching in Then RR it Why take a chance? You are right there now.

 

grinding? what grinding? we're just getting started. you'll notice on the outboard area the tab has let go and caused a bunch of trouble. Not to mention the top half of the bulkhead rotted away because the water inlet was leaking continually onto the wood.

 

"when in doubt, grind it out" has always been my motto, your going to be glassing in there anyways, so why not grind a little more, throw in glass you already have wetted out and then switch to the other old laminators saying
" Do your best, and grind the rest"

 

NO! looks fine

 

heres the progress

I'm still grinding in spots all over the place

 

a better shot

I installed a tab 12" wide and 36" long to locate the aft bulkhead, the new floor sandwich panels are coming in. notice we used foam to fill in any voids before laminating