How can I fix This?

I tried to put a thin coat of 24 hour epoxy over the top surface and it came out really lumpy with tons of dips and holes, I mixed the epoxy for 3 minutes and waited 30 minutes before applying to try to get the epoxy to be less runny , on the bottom side it came out almost perfect, but the top looks like this. How can I fix it because this is driving me nuts.