Just looking at the

Bonide Product 166 Rot-Stop Concenatrate 16 Oz- Its just a calcium product. This is mainly for the prevention in Blossom End Rot in tomatoes.

Bud Rot Stop 250ml- Doesn't have much info on it. But it looks like its not a sulfur, copper, or calcium product. It sounds like its more of a ACT (aerated compost tea). It says
100% natural bacterial liquid
so I think the bacteria colonizes on the plant and doesn't let the PM or Botrytis take ahold.

Out of the two I would go with the Bud Rot Stop. But, I donā??t truly know if it would work.
I do know for a fact that ACT(aerated compost tea) will not allow PM or Botrytis to take ahold.
And if needed the best way to get rid of any mold is GreenCure fungicide for curing and preventing powdery mildew, blights, molds and other plant diseases
Hope this helps
L8
MJ