Applying heat to the seal coat.
There are very few times when you will need to use a torch on the seal coat. One time would be if you are brushing onto a backsplash, you would use a heat gun or blow torch to remove brush strokes. The other reason would be to smooth out the flood coat on live edges as it is pouring over the sides since you need to use a brush to fill in all the crevices. The flood coat will cover any irregularities in the seal coat. The flood coat will need to be torched or heat gunned.