If you take a look at these options for your project and do feel free to get back to me if you have any further questions, and as always my advice is always to try a test area first. Once we have a better understanding of the issue, we will be able to recommend some actions and what products will be needed.

Oak Bannister Treatment — MoneySavingExpert Forum Oak Bannister Treatment — MoneySavingExpert Forum

It will be difficult to keep a piece of wood that age totally natural and unchanged, the age of the oak is highly likely to result in some considerable darkening when you apply a clear product to it.These 2 products will better retain the natural, freshly stripped or sanded look rather than darkening and enhancing the wood grain. We recommend lightly rubbing the surface down between coats with 320 grit abrasive paper or Ultra Fine Steel Wool (0000) to remove any blemishes. They are lovely looking pieces are were quite expensive but obviously can’t have mould growing next to our sofas. This helps to ensure an even all over result, the key to a great finish is always in good preparation.

Ronseal Interior Varnish Satin French Oak - 250ml | Homebase

It is always better to apply a coloured oil, the pigments are far better for UV protection and reduce the natural silvering of the wood. We’d suggest you apply Osmo Wood Protector (4006) first and then follow it up with Osmo Polyx Oil (3062), although you’ll need to keep on top of maintenance with this, otherwise water rings are inevitable unfortunately. It has marks (biro scribbles, some etches) in the table top which I know I need to gently sand (emphasis on gently as it’s partly veneer! So we sanded off the osmo and treated with Oxalic and have now got the natural slightly silvered colour back. Then sand for the final time at a 150 – 180 grit sandpaper, always in the direction of the grain of the wood.they have been using their source for at least 2 years, because the standard of oak preparation only becomes clear around 12 months after it has been made into furniture. To keep the wood looking as untreated as possible you could also look at the Osmo Polyx Oil Raw this has a minute amount of white pigment to counter act the darkening effect of a clear oil, however it can not be used with the Wood Protector as this darkens the wood and will defeat the object of using the Raw. For your exterior wood you could again look at Osmo products, Osmo Natural Oil Woodstain has a wide range of natural colours and white. Anything less than this degree of quality control could leave you with an imperfect finish on your hardwood flooring.