hopefully someone more knowledgeable will step in...until then

- the internal pics seem to show a putty/cosmetic repair and not a woven cloth/structual repair

- you want to aim for something like
1. cleaning out the previous repair's? bondo and getting down to woven glass on both sides...this will be easy on the outside and difficult on the inside

2. putting a small patch of woven glass over the bare crack that overlaps all areas by about 2 inches

3. putting a 2nd patch on top that overlaps by about another 2inches

3. putting a 3rd patch over that with another 2 inch overlap

4. let set, fill crack void on other side with chopped up glass and resin, let set, grind flat

5. repeat 3 layer repair on other side, let set

6. fair outside repair with filler

7. brush over white gelcoat