Sorry, I thought you meant the decal was cloudy after having Tru Oil applied over it. It could still be a moisture issue reacting with the TO under the decal.Thanks for confirming ! Heading off on holiday for a week so it will have a good 4-5 days to cure
TBH, I'd peel it off and start again. 4 coats of TO is bugger-all really. I would apply as many coats as it takes to start to develop a level of gloss and then re-apply the decal.