I am getting ready to paint the 11″ wide rough sawn horizontal cedar siding on my 1975 house. What is the recommended method of plugging the knotholes? The knotholes are anywhere from ½” to 1 ½” diameter.
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Since you're painting
and only need to get a finish that's close to the grain/rough sawn pattern, I'd use plugs of whatever kind you wish (pvc trim scraps, dowells, other-and epoxy. Take a scrap roughly the same shape (if round-drill out plugs with a hole saw). Get enough of them ready so you can set them b/4 the epoxy hardens. Apply some epoxy around the inside edge of the hole-butter the edge of the plug. Place the plug in the hole-register it to the rest of the board using something flat to press in the plug till it's flush with the board.
Once hardened-apply aanother final covering which you can add grain marks to dragging a small knife across it. Or, if you get lucky-the final moments as it starts to take off-just dragging a putty knife across it flat will produce a rough sawn appearance.
Small holes-fill with Urethane caulk and texture it to match the boards appearance.