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Yes, you can fill rotten wood with expanding foam. You may prefer using an expanding foam treatment instead of wood filler since the latter can take a long time to dry. It may also provide an easier solution when you’re dealing with smaller gaps. If you use expanding foam, allow it to cure for about 24 hours before you sand and prime it.

It can take as little as 30 to 60 minutes for wood filler to dry, but some products take up to four hours. Always read labels to ensure you're following the manufacturer’s instructions. Water-based wood fillers typically take longer to dry than oil-based or epoxy-wood fillers, especially when applied to large areas or deep cracks. Wood putty won’t dry completely, remaining slightly pliable.

It takes the average person four to eight days to refinish a table. This sounds long, but the work time is only two to 10 hours. If you have prior experience, each step, including dipping, stripping, sanding, staining, painting, and sealing, can take just 30 minutes to complete. The wait time between each step results in a longer total time.

If the scratch is large enough that it compromises the integrity of the wood, a wood filler probably won’t be enough to fix the problem. In that case, you might need to sand and refinish the entire floor or replace a board. If you do use a filler, use one that’s appropriate for the scratch. Water-based wood fillers work for small gaps or gouges, while epoxy has added strength to fill larger scratches and gaps.