Why do other wood fillers fail?

Many exterior wood fillers fail because they swell, crack, and eventually pop off of the wood. These wood fillers fail because there may still be moisture inside of the wood which expands and contracts with varying weather conditions, worsening the rot underneath the wood filler, possibly accelerating it. Restor-It Flexible Epoxy Filler is different because it cures and stays flexible. The flexibility of the Epoxy Filler allows the filler to adhere to the wood much better as it allows the filler to move with the wood during varying weather temperatures. This ensures that Restor-It Flexible Epoxy Filler will never shrink, crack, or pop off of the wood it is applied to.