Newbie question about tru-oil walnut stain

Has anyone ever used the tru-oil walnut stain and then finished off with the tru-oil itself?

I've used tru-oil before with very good results and was looking to stain a mahogany tele body a deep, rich colour and thought the walnut stain that came in the Birchwood-Casey kit might be just the ticket.

Would I need to use the sealer first, sand back and stain over the top, finishing with tru-oil? Or would the sealer prevent the stain from soaking into the wood? I was also wondering if the stain would colour the water based, maple coloured grain filler I've got lying around that I bought from Imii?

Thanks for any words of wisdom!

I really don't have experience with Tru-Oil stain but I have used various Watco oil stains on woodworking projects over the years. I don't think an oil stain is going to work well over a sealer or grain filler............. and they don't work well at staining maple.
An oil stain should work well on bare wood mahogany.

I just finished an ash body with the Birchwood-Casey walnut stain and Tru-Oil and it came out well.

Prepped the body with natural colored filler and sanded to 600 grit. Dampened the wood several times to raise the grain but it still came up along the end grain when I applied the stain. The walnut stain is water-based. Two applications of stain and very light sanding to smooth the grain brought it to a pleasing dark finish. Using the natural colored filler gives a three-tone look, where the ash grain is darker, body is warm walnut brown, and filled grain is a lighter brown. Waited a day to dry, then applied four coats of Tru-Oil over four days, using #0000 steel wool between coats.

I let the final coat dry for two days and lightly applied rubbing compound and cleaner wax to smooth out the finish. Not a high gloss but not matte either, gives a nice sheen that will wear-in over time.