What is the difference between SEAL-ONCE NANO GUARD, NANO GUARD PLUS POLY and ACRYLIC POLY?

SEAL-ONCE® NANO GUARDTM is a non-film forming, deep-penetrating, nano-polymer formula that creates a flexible breathable barrier to protect wood and concrete/masonry against damage caused by water-ingress. SEAL-ONCE NANO GUARD PLUS POLY combines our proprietary nano-polymer formula with the strength of polyurethane to provide 360° of protection for wood and concrete. SEAL-ONCE ACRYLIC POLY forms a flexible barrier that shields wood, concrete and masonry from water damage, abrasion and harmful UV rays.