Varnish over prefinished benchtop?

I picked up a couple Acacia benchtops from bunnings that have been hardwax oiled out of the plastic. I'm using them for some furniture and they will require a sand(biscuit joining them in wide strips to oak). After sanding the wood it naturally turns very pale. I don't have hardwax oil nor do I have any experience applying it so put some paraffin oil over a test piece and it brought the color back somewhat brighter, which is what I'm after.

My question is can you put an oil based satin varnish over the top of the timber after the oil has been applied? how long should I wait before doing so?

Thanks!