The caulk between the coping and pool deck is wearing away on my pool. I was thinking of using some backer rod and Vulkem 116 or Vulkem 45 sealant (no preference on brand, but those 2 seem to be the ones I'm finding). Does anyone know the difference between these 2? Is the 116 self levelling?

I was looking at buying these online...can't find them in a local store or something equivalent to these. Any other ones which might be available locally?