Paul,

Here's my take:

Whip out a trusty scrap piece and recreate the screw-up with the resin. The stuff that dripped is already into the serious cure state and it won't matter about the timeliness at this point.

Apply the stain in question, let it dry as per and apply the epoxy glass and then the varnish or whatever you will be using to finish the boat. This will give you the outcome of the work done to date as a finished product without committing the boat to a bad outcome.

If the section that was sanded looks noticeably lighter, use another scrap of the same ply, and try to mix a custom color of stain that is darker so that it will compensate for the lighter area. You might have to try several different blends to get the right effect. You'll need to glass and varnish the tests as well to see which one turns out the best. Keep strict records of the technique for each possible solution so you can repeat it later on the boat.

Another possible go is if you have a really good pro painter's supply house nearby, go see the guy who mixes the colors and the finishes and explain the dilemma. Either he will have the juice to do the job or he'll know of a whiz at matching blended stains to get you good result.

One of these guys will be able to help you with how to blend the new stain into the rest of the unblemished field to achieve an overall uniformity.

That kind of info is worth its weight in whatever is the coin of the realm.

I used to have a cabinet and custom furniture shop years ago and it used to scare the crap out of me when a customer had a problem like this one. Then, one of my buddies who is a painter/finisher whipped up a magic solution and we got the problem solved.

Since you did the stain originally, you already know the chemistry that you'll need to be compatible. That, in itself is a good start.

Chris