Flexible Gap Filler For Wood Floors. Another option for filling gaps in wood floors is to use caulk. To use caulk, simply apply it to the gap with a caulking gun.
It comes in a variety of colors, so you can choose one that closely matches your flooring. Another option for filling gaps in wood floors is to use caulk. Caulk is a flexible sealant that can be used to fill small gaps and cracks.
