... I dont use primer?? The threshold to my built-in wardobe has paint missing where it looks like the previous home-owner has sanded the threshold to accomodate a dropping door, as opposed to just re-hanging the door. I've now re-hung the door and I'm wondering how to fix the bare patch of missing paint. After doing a bit of research it appears I should prime the bare wood before applying the satinwood. But what exactly would happen if I didn't use the primer first? just went ahead and slapped a couple of coats of dulux trade satinwood on instead??