How do you fix thin scratches without wood filler?

You could use nail polish remover. Just dab it in a cloth and rub it gently on the surface to remove the markings.

Yes, if you allow it to dry all the way. Moist wood is to hard to use, but dry wood can be used.

Old timer trick: Take a small blob of the filler and drip a few drops of the stain on it. Knead it together and apply.

For outdoor use, I recommend using Douglas fir or vertical grain Douglas fir. These woods hold up very well in outdoor conditions over time. For indoor signs, good choices are...

When people say 2 by 4, the wood is actually 1 and a half inches by 3 and a half inches. When you go to purchase the wood you can...

Not overly.

Use a furniture refinisher to dissolve the stain and scrub it away with a bit of steel wool. Although it still involves some scrubbing, this approach is less damaging to...

You can visit a dermatologist or consult with a plastic surgeon for recommendations.

You probably want to lay off of the acetone and abrasive chemicals for a while. Just give your nails time to recover naturally, since you may be drying your nails...

In general, infections after a dermal filler are rare. Signs include redness, pain, warmth, or excessive swelling at the injection site.