Depending on conditions, you dont need dryer. It just speeds up the chemical process. Mix small batches of your blend, and add no more than a couple drops of dryer. If you add dryer, discard any excess batch that has dryer. If you skip the dryer, you can keep using the batch of finish for a few days, IF you keep air away from it and replenish a little of the solvent. I wouldnt go more than three days before blending a fresh batch.