If this is the tip of the bow, one option is to cut 4-6" of the tip off and put a solid piece
of wood there. Other than that I'd add extra glass to the thin spots. Also for those 1/8" strips you could
glue another strip to the back of those..sand it enough that you can smoothly glass over them..I probably
would be satisfied with an extra layer of glass pasted on those and call it good.

: So, I am at the point of sanding my kayak before fiberglassing, I
: was working on the bow section of the deck and (I will admit I
: didn't do a great job with the strips laying flush at the bow),
: I sanded right through one of the strips on the edge, and the
: rest of the bow seems to be pretty thin (1/8"). My question
: is: how thin is too thin, and what do I do about the part that I
: sanded through. I already put a new strip in it's place but I
: had to sand it down to blend in and I was just left with another
: extremely thin piece.