I am leaning toward the rationale that continuing to powerwash will expose all the loose voids and, unfortunately, cause more work for me. My logic being "do it right one time instead of halfway 3 times". If they are popping out it's because it's their time to go.
My question now is practical: assuming I choose an appropriate epoxy (I can't remember what type is recommended on gelcoat, but I'll look again), how realistic is it to simply "spatula it on". Having never physically done this work is it really so simple? Simply squirt a bit on the affected area and then "Squeegee" it into the holes? I just want to know that (as I will be working against gravity under the boat) that the epoxy isn't going to just plop out of the holes once I fill them. Is the stuff so thick and pasty?
Do I really need to dremel them out first?
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Would it be better to get some syringes and squirt into holes; and then spatula; and then sand flush after cure? Or skip the syringe (sounds silly now that I ask)? I only ask because of the thought that air pockets could get trapped the voids as I spatula.
Thanks everyone for taking the time to help someone not so familiar with fiberglass repair...