finish for wood walls

Hi all again.
We have some recycled wood walls - mainly red ironbark, grey ironbark, tallowood - these are dressed and various colors from dark red to pale red, dark to pale brown and pale yellow. Also we have some big recycled timber posts and beams which have been roughly finished with a grinder to get the grey surface off.

We want to use a natural looking matt to low sheen finish which is easy to apply.

Does anyone have any feedback on the following?

1. Sikkens Cetaol TS Interior - looks natural on the sample we did, but a concern is whether it will go yellow on the blonder timbers - like our ceiling did when we used a non-yellowing Cabots product.

2. Treatex whittlewax - not commonly used here, looks rich and lustrous but darkens the timber more.

3. Waterbased polyurethane finishes eg Haymes Aqualac etc. A bit more shiny with some film buildup.

Any other suggestions?

Even whether it might not be necessary to coat the big posts and beams - the roof is now on the house - but we definitely dont want them to go grey.

We want to make a good choice, as there is so much timber we dont want to have to remove the product if if does not work.

Thanks for your time and feedback.
Sandstonehouse

PS Will attach some pictures when I get a chance.

If its interior I wouldn't go past Cabots clear floor finish (water based)
Its crystal clear and unlike many of the water based finishes its sets quite hard so it won't mark easily.

We have a jarrah front door that is finished in Sikkens Cetol - one for exteriors. The door is in a fairly exposed site (not under an ovehang) - as with walls - and on the southern side of the house, so little direct sun. It's terrible. It doesn't last long at all. It fades quickly and looks tatty. We are looking for a better product.