Can I apply the epoxy with a roller, squeegee, or notched spreader?

No. UltraClear Bar & Table Top Epoxy is a self-leveling product, so the final layer always needs to be poured out and allowed to level on its own. It cannot be applied with a roller, and it can't be troweled or spread around the way a flooring epoxy would be. Once you pour a batch out, leave it alone: you do not spread it around, and it self-levels to 1/8" thick.

The only part of the job that isn't poured is the seal coat, which is brushed on with a paint brush in a thin, even layer over porous surfaces such as wood, veneer or tile with grout. Brush the seal coat on, wait 4 to 6 hours, then pour the flood coat in batches of up to 1 gallon (1/2 gallon resin + 1/2 gallon hardener), mixing up a new batch to carry on where the last one left off until the surface is covered.

If you were hoping to roll or spread the epoxy across a floor, it can still be used there. Customers use it for penny floors with good results, but the flood coat is poured, not rolled. Mix in batches of 1 gallon or less, pour as you work your way out of the room, and pop the bubbles in each pour with a heat gun or torch.

Floor guide: https://ultraclear.helpscoutdocs.com/article/324-epoxy-for-floors Tutorial videos: https://www.bestbartopepoxy.com/tutorial-videos/