Another tip for Salls users. I have one of these bottles Skip posted
Wapsi Applicator 1/2oz Plastic Bottle | Head Cements | Cements, Glues & Paints | Fly Tying Materials | Bob Marriott's Flyfishing Store
I put about 1/2 Sally's and 1/2 polish remover. Thins it down real thin. Couple of drops does the trick. Runs through thread and does not build up like straight Sally's. Also if your Sally's starts to thicken in bottle just add a little remover to thin it back out. Makes a bottle of polish go a long way.