Quote Originally Posted by David Ruby
By drydown, are you saying that when the print dries it will look darker? So to compensate, you really need to make sure your proofs are dry before deciding on the proper exposure etc. right? Thanks.
Yup, you got it. This is most noticeable when printing on fibre papers; RC paper will exhibit either no drydown, or very little. There's another thread currently undereway that is discussing drydown, btw.

A very simple way to avoid drydown is to inspect your work prints under a dimmer-than-normal inspection light. If your inspection light it too bright, then you'll be forced to print the highlights darker to get detail. Using a dimmer inspection light will help you avoid this effect.

Regarding exposure, I've never used times for creating proofs for determining exposure times for larger prints - the enlarger is almost certainly at a different height, for one. Contrast is generally different as well (contract printing vs. enlargement); the exposure for your proofs is therefore not really applicable to your real enlargements. Instead, setup your enlarger, and take a stab at what the exposure will be. After a while, you'll be quite good at zeroing in on the right exposure, or close to it.