A year after putting the final coat of paint on my 1927 OT Double Ender, I'm looking at tack heads pushing up under the canvas. Bummer! Obviously I didn't clinch them enough. Rookie mistake! The thing is, I'd swear those proud heads didn't show when I canvased, filled and painted. The final job looked smooth as silk. So what gives? Full disclosure, I used Chil-Seal water-based filler instead of the traditional boiled linseed stuff. Did the filler shrink down? Did the tacks work their way up? And of course, is there a fix, short of recanvasing? BEFORE: No hint of the horror beneath. ONE YEAR LATER: Dimples of DOOM!