Best Polyurethane
Gorilla Original Gorilla Glue Waterproof
Gorilla
And expanding formula fills gaps in rough or imprecise joinery. Keep in mind that foam expansion requires cleanup, squeeze-out expands and must be removed before curing.
- 100% waterproof polyurethane
- Expands 3x to fill gaps
- Works on oily hardwoods
- ANSI Type I equivalent
Pros
- 100% waterproof, suitable for outdoor and marine applications
- Expanding formula fills gaps in rough or imprecise joinery
- Works on oily tropical hardwoods w here PVA fails
- Bonds wood, stone, metal, and foam, versatile for mixed-material outdoor projects
Cons
- Foam expansion requires cleanup, squeeze-out expands and must be removed before curing
- Requires moisture to cure, wood or one surface must be dampened first
- Expansion can shift joint alignment if parts are not well clamped
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