^^^ so use a west 209 super slow hardener if you want to to go slow. I use all 3
But yeah I'd know fk all after 20yrs of moulding carbon parts for racecars, manufacturing a high end composite rifle stock and repairing sandwich WS boards. I just didn't feel the need to put up a bunch of pics.
Your $2 sh1t is fine for a temp repair or tacking things together (I've used it for exactly that) but when he says soft rail around the ding to me that means proper repair. To you that means just using a bit more $2 crap??

I hope not.
It is a new board he has hardly used, so if he follows your advice he ends up with a yellow globby crap rail and whilst yes, he
is back on the water, he is likely disappointed.
BTW nice use of 'exothermic' but that does not denote an expert.