I have a fence that's made of white cedar that didn't have a stain or sealer applied before. I stained it with a oil that was natural pigment. My wife wanted a more reder color to match some western red cedar siding we have.
can I just get a different tint stain and apply it?
That's not an easy question to answer from this end doctor. Read the can. All stains are different in number of coats and the procedure for applying them. Some are one coat only, which seals the surface, and applying a second coat on top will result overapplication--high sheens and likely failure of the second coat. Some are two coats. But they may be two wet on wet, which means you can't apply the second after the first is dry. There are a lot of variations when you deal with these types of non-solid stains. Read the can or, if you can, call the manufacturer for guidance. We see a lot come through here who mis-apply stain, including one recently who didn't read the can--until after--where he found it clearly stated one coat only. Good Luck.
Listen to Joe Sheridan, Doctor. The problem with many stains is that they seal the wood and then when you go to apply another coat, the stain just lays on top and doesn't penetrate. Basically the stain repels itself. You've got a mess on your hands to be sure. Personally, I would not take any chances. Let it weather for a year and then retry the stain. Then, make your wife do it, LOL.