I've reached that stage when I need to prepare the icon for its gold leafing.
I've built up the red bole a bit more and then will give it a light sanding with a very fine sandpaper. After removing any grit, I'll give all red bole surfaces a thin coat of oil-size and let it completely dry. This provides a good hard surface to work from.
Once fully dry, I'll give it another sanding with very fine sandpaper, and after carefully removing all grit, I'll do another layer of oil-size but this time, being ready to apply the gold between the 3 - 4 hour mark when the size reaches the right tack.