|
The problem with refinishing an old stock is there is no way to tell what contaminants are on the surface and in the wood, and how they will affect absorption of stain.
That oil you can no longer see may still be in the wood and affect stain absorption.
One of the ways to prevent blotching uses a thin coat of shellac to try and reduce absorption.
The shellac is absorbed unevenly and tends to block the stain from being absorbed in the same places.
Sometimes it works, sometimes it does not.
Using gel type stains allow for slower absorption and more time to try and correct problems.
Same problem though, sometimes you can get a more even color, sometimes not.
If the contaminant blocks very well, no waiting is going to make the color absorb at that spot.
there are other problems that can alter the color.
using to fine a sand paper grit can burnish the wood so there are not enough scratches to capture and hold pigment stain.
To coarse a grit leave s rough surface and the pigment is then captured excessively in the scratches and looks bad.
Using tinted varnish helps a lot.
Nothing is absorbed, everything sits on top of the wood's surface.
Scratches can still look bad though since the finish will be thicker (and darker) in the scratches.
About the only thing to do is try, and if you are not satisfied with the result, try again.
|