I just had my Amazon handyman apply this.
He only applied one coat (i guess because it full masked everything with a single coat). The insturctions say its best to use two coats, but they must be applied after 3 hours of first and before 6 hours.
1) Do i really need a second coat?
2) What would happen If i apply the second coat after a day or two?
What type of tub is it? Cast iron? Chances are, they recommend applying the second coat immediately when dry, to avoid having to re-clean the tub, but it may not cling to the first coat as well if not applied when fresh. You can apply the second coat as if it were the first, if you'd like, but I do not know if it will hold properly. 2 coats ensure the original color of the tub is properly covered, as well as any cracks, scratches, or scuffs.