Wet Sanding Thoughts

I've read a few forum posts where new builders talked about wet sanding.

That piece of 400 grit (wet/dry) sandpaper in the glass of water is only about 2" X 4" in size. That one piece should be more than enough to fully wet sand a Big Bertha sized model.
You can leave that wet/dry piece of sandpaper in that water glass overnight if you wanted to - it's waterproof! It's a good idea to let the sandpaper sit in the water a while before sanding. You'll want it saturated so it won't load up with sanding paint dust.
Shake off the excess water, sand a bit then rub some of the "mud" off the sandpaper.
Keep the sand paper wet, and paper towels handy to catch drips.

Don't wet sand Carpenter's Wood Filler! Dry sand CWF.
CWF does not seal the wood. Even after it's dry, it's still water soluble.
Only wet sand parts after they have a good coating of primer or color coats.
If there is any brown body tube or balsa peeking out on a painted part, water will be absorbed, The open, unsealed area will swell up!

If you've seen my primer sands, I tend to dry sand the primer back down to the surface, especially on body tubes.
When I wet sand between final color coats, I'm only knocking off the top of the coat, just taking off the roughness and dulling up the surface a bit.

Here's my typical finishing order:
1. Fill balsa grain and body tube seams with diluted CWF. Mix Ratios are HERE
2. Let dry, then dry sand with 400 grit. (Sanding dried CWF does not load up sandpaper)
3. Spray gray primer/filler coat. I tend to lay down only one coat (heavier than others might) and dry sand to surface. (The gray primer will load up sandpaper) Clean off loaded sandpaper HERE
4. Check and prime again if needed. (Not normally needed)
5. Gloss white coats follow. Two light coats, then wet sanding. The two light coats will have sealed the surfaces so you can wet sand.
6. One final heavier, "wet" coat. This can give you a great gloss without the need for Future acrylic later.
The last coat goes on heavier, but not thick enough to run. Hold the can closer to the model and move a little slower.
Best results of a applying the heavy last coat comes with practice!

Always take your model outside and check out the finish under direct sunlight. You'll see any imperfections better outside than you ever could under indoors.