Cost: $4.95 USD
Available at: Walmart, Ulta

MY 2 CENTS
At Walmart, I paid less than $5 for Sally Hansen Insta-Dri in Clearly Quick and never, have I ever, loved a top coat so much!
It dries quickly- like within seconds! It protects my polish from chipping for almost a week! I cannot tell you how the rest of the Insta-Dri line works but Clearly Quick is incredible. I’ve tried top coats from higher-end brand that double and triple in price but are no where near this good.

BEST.TOP.COAT.EVER

What is your favourite top coat?

INGREDIENTS
Ethyl Acetate (clear liquid with fruity odor), Butyl Acetate(clear liquid with fruity odor), Nitrocellulose (film former used for coating), Triphenyl Phosphate (used for adhesion), Adipic Acid/Neopentyl Glycol/Trimellitic Anhydride Copolymer (film former), Isopropyl Alcohol (used to decrease thickeness), Styrene/Acrylates Copolymer (film former for opaque products), Trimethyl Pentanyl Diisobutyrate (plasticizers), Stearalkonium Bentonite (gel former), Benzophenone-1 (absorbs UV rays), Stearalkonium Hectorite (a suspending agent), Methyl Methacrylate Crosspolymer (increases viscosity), Sucrose Acetate Isobutyrate (prevents ingredients from separating), Ethyl Tosylamide (increased nail polish wear), Dimethicone (anti foaming agent), Aluminum Hydroxide (used for opacity), Citric Acid (natural preservative), Calcium Sodium Borosilicate (bulking agent), Calcium Aluminum Borosilicate (bulking agent), Synthetic Fluorphlogopite (bulking agent), Silica (silicone used to harden polish), Tin Oxide (bulking agent).