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Ah don't worry, haven't gone mad with it! Its not a pure tung, its a mix from a local wood workshop out of their big tub, 1st layer was watered down with turps, maybe not 1:1, but crazy thin feeling. Its more in the wood than it is on top of it. Its usually been 2 days between layers, sometimes more as I don't have time to go back to it after work. Realise it probably takes a solid month until it goes really really hard though.
Might try on a waste bit of wood to see what happens with it. In no rush to mess it up. That old Unika stuff did 3 to 4 years of basically no maintenance required, 1st year was lots of adding layers, years 2-4.5 have been super easy, only the very edge of the sink cutout (router cut 90 degree unslung sink) has needed topped up on its edge. So trying something new because that old stuff isn't available any more.
Had some really fancy varnish left over from a local boat builder/carpenter guy, but in the past had a varnished top and they are absolutely great until you get damage, then you have to strip the whole thing and gets a bit annoying fast.
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BrickMan
@Bobbo
Err I hate to be the bearer of bad news but I think you may be doing it wrong.
Pure tung oil should be applied using a 1:1 dilution with a solvent, I usually use naptha (lighter fluid). It needs to be left to off gas between coats, as this happens the oil in the oil solvent mixture hardens. It does take a while for it to off gas between coats but it is imperative that this allowed to happen as if you build up too thicker layer of the oil you run the risk of it gas checking (the finish will appear wrinkled). If the tung oil has been properly applied it should look wet (if you apply too much it looks plasticy) and this finish will be hard and almost impermeable.
For the reasons I have outlined above I would never recommend tung oil for use as a finish on a worktop despite the fact it's foodsafe once cured.
I fear that the way that you have applied the tung oil will mean that you will get a blotchy, inconsistent finish with the Osmo. It's worth a shot but you may have to start again...... Sorry.