Rather than pouring the melted wax on, take the bar and rub it on the base. This'll leave an even coating of wax all over which you can easily iron in.
If the wax is smoking your iron's too hot.
If you're still having trouble getting wax on you could leave the bar next to your boiler (or something else warm) for an hour or so before you rub it on.
My bench is next to my boiler room so is super warm. If its cold where your tuning that might be part of the problem.