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Nail Hole/Crack Filler for Exterior W...

Cam_Haygarth's picture

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I am trying to restore some old exterior woodwork on my house including trimwork & clapboards. There are many holes where nails and screws used to be.

What is the best filler to use on exterior work that will be painted? This filler should be sandable. What about a basic exterior spackle compound?
Any thoughts or ideas would be much appreciated.

Thanks in advance,

Cam

(post #167542, reply #1 of 9)

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(post #167542, reply #2 of 9)

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Cam; How about trying automotive bondo. It's sandable, durable and fun to work with. While your at it we've found that spot primer another automotive product works good to feather out depressions in the paint caused by missing paint chips. Minwax makes abondo type material for wood. I personally don't see any difference than regular automotive bondo other thanthe color.

(post #167542, reply #3 of 9)

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It is no different, just the color! Have you seen the stuff made for furniture repair in pine color. We use it all the time, works great!

Louis

(post #167542, reply #5 of 9)

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Ditto previous comments about Bondo, works well. I've been using a PC 333 random orbit sander with 60 grit paper to level and feather out the Bondo ....it seems to work well. I' ve also used Marson's body filler with excellent results. You can sometimes salvage rotted wood with body filler. Dig out the rotted wood till you get back to solid wood. Mix up some two part fiberglass resin and apply it (chip bristle brush works fine) to the exposed wood fibers and let cure (dry) ....it stiffens up the fibers. Then fill with body filler and sand. It works well for small areas (like saving architectual details).

(post #167542, reply #8 of 9)

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Bondo works best on metal. WoodEpox from Abitron attains a molecular bond and expands and contracts with the exterior wood. It may be overkill for nail holes but nothing works better on lateral cracks.

(post #167542, reply #9 of 9)

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I am trying to restore some old exterior woodwork on my house including trimwork & clapboards. There are many holes where nails and screws used to be.

What is the best filler to use on exterior work that will be painted? This filler should be sandable. What about a basic exterior spackle compound?
Any thoughts or ideas would be much appreciated.

Thanks in advance,

Cam

(post #167542, reply #4 of 9)

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Cam,


There's a product called MH Ready Patch®. It will be just fine for what you need. Home Depot sells it if you can't find it in any of the local stores.

Joseph Fusco

Fusco & Verga Construction Co., Inc.

(post #167542, reply #6 of 9)

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The bondo products work great...and stick to the nail heads. They don't seem to bond that well to wood and will swell if exposed to prolonged moisture. On exterior trim (Paint grade), we use mastic putty. Doesn't shrink and stays soft, paint sticks to it and just wipes off. The exterior spackle seems to soften up , again when exposed to moisture, so the automotive glazing putty sounds like something to try out. The spackle also shrinks...no matter what it says on the tube or can. When doing stain grade trim we use the epoxy with sawdust and make our own putty.

(post #167542, reply #7 of 9)

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Don't know the size of the holes you are filling. On two old houses, for nail holes and minor cracks, I prepped and primed, filled holes with DAP oil glazing compound, first coated, touched up any gaps with a good latex caulk (knowing it was primarily cosmetic - not weatherproof for long) smoothing with a wet rag where necessary, and final coat. On both houses the patches have lasted well in Chicago area climate. But have also used the Minwax products - consolidant and putty - for bigger patches with success.