I have treated my self-built electric guitar with Truoil (the wood is thermo-treated maple). I followed the instructions exactly (only application with 24 hours waiting time between coats, in the meantime treatment with steel wool). After 5 coats, the surface was unfortunately not homogeneous. Some areas remained matt, others shiny. After waiting a week I applied Sheen & Conditioner according to the instructions, even after multiple polishing the matte areas did not disappear and the surface feels slightly sticky. I have two questions:
1) What could be the reason for this? Could it be that the Truoil has expired (I have had the bottle for 5 years, it has been opened at that time).
2) I would like to touch up the surface now and apply Truoil again. To do this, do I need to completely remove all of the Truoil again or is it sufficient to remove the top layers (including sheen & conditioner) again with steel wool and reapply to the remaining Truoil layers?
Who has experience with this? Am very grateful for any help!