Furniture, Wood and Cabinetry Finishing - re-staining oak with tung oil finish over stain

I recently stained an oak entertainment center with oil based stain and then finished with tung oil. Since then I decided to go with a darker stain but do not know how to begin. Do I need to remove the tung oil and then stain the piece with darker stain? Or will the new stain penetrate the tung oil finish, after which I can re-apply the tung oil? The previous stain will not affect the new darker stain as tested on an unfinished piece of wood, so I do not plan to remove the old stain.

In most cases, a stain applied over a finish will come off because it will not penetrate the finish to color the wood.

If you want the piece to be darker, you can strip the current finish and start with the bare wood and apply the stain and finish as you like. To try to darken a piece over the current finish would necessitate finding a stain and finish in one product and applying it over the existing finish if such were compatible.

In reality, you will have to strip the piece and start over.

Hope this helps.

Which type of stripper should I use for tung oil? The guy at Home Depot suggested a general purpose stripper (Klean Strip Remover) for lacquer, varnish, and shellac. None of the products at the store mentions tung oil, so i bought the gen purpose but have not yet used it.

I imagine that any general stripper will work. Klean Kut, Stripeze, or other.