Hi @L3mon1980,
It looks pretty clear to me that the far end of the deck has absorbed the oil far better than the closer end, which makes me think the two ends of the decking timber have been subject to different conditions. To have the most consistent absorption of decking oils, the timber needs to be as uniform as possible, which is done by weathering the timber and sanding where needed.
Did you weather the timber before installing it? Is that end of the deck exposed to the sun and rain more than the end closer to the camera? Was the timber in place for long before you oiled it?
Do you have any more photos of your deck from outside the glass windows? Does it look like that at all times of the day, or is it worse when it is cold or in the mornings?
Is there anything at that line that is an obvious difference between the two sides of the deck? Is there a concrete slab under part of the deck and natural ground under the other half?
It looks like a fairly consistent line that makes me suspect the issue might be related to what is under the deck, or perhaps the weather that the end of the deck has experienced.
It could be that the far end, being more exposed to the weather, has leached more of the natural oils in the timber, meaning it has absorbed the Intergrain Universal Timber Oil more consistently.
Unfortunately, if this is the case, then you are likely going to need to use Cabot's New Timber Prep as well as Cabot's Deck Clean to remove the oil and return the timber to bare before reapplying your oil.
Let me know what you think, and please don't hesitate to ask any further questions or concerns.
Jacob
