window sill filler

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kel789

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I have large connecting patches peeled off from an interior window sill. It was some kind of hard chalky layer underneath its wood. I have already used 16oz of wood filler of DAP Plastic Wood but it turns out I need about 32oz more. I am now looking at joint compounds in powder form and not sure if it is a good choice. I will be painting over it. Can you recommend some kind of filler? Thanks.
 

oldognewtrick

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Sounds like moisture has caused an issue. Have you fixed the cause of the peeling?
 

kel789

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It's an apartment window sill. It has been rained on for about 17 yrs on many occasions since the apartment was renovated by a contractor. It is my guess that the issue is from the rain. I have already scraped off loose pieces, peeled the loose paints, already applied some wood filler, and realized I need a lot more. It does not good like a pro work. I am thinking of flattening the surface with filler, sand it smooth, and paint it. What do you think? Thanks.
 

bud16415

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I like a polyester resin product used for car repairs called (Bondo) for stuff like that. Auto parts stores or even Walmart sell it. it comes in quart cans and you use a liquid hardener. Put a glob about the size of a golf ball on a coffee can lid and then add a line of the hardner maybe an inch long, mix it up good and spread it on. It will start to get hot and hard in about 5 minutes so work quick. Sand and prime and paint. Seal the can up and the unused will keep for years.
 

Eddie_T

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I repaired the bottom of my front door with Bondo 20± years ago and it's still holding.
 

Big_Bill

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Is that an air conditioner in the window (3rd pic)? Is it draining properly? :rolleyes:
 

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