Zinsser Gardz Water-Based Problem Surface Sealer, 1 gal vs Flex Seal MAX 17 oz (2-pack) Black sealant coating
Overall winner: Flex Seal MAX 17 oz (2-pack) Black sealant coating
Key Differences
Flex Seal MAX (A) is a spray-on, waterproof sealant marketed for roof and exterior repairs and comes as a 17 oz 2-pack; it emphasizes a watertight finish and paintability but has mixed views on value and some spray mechanism issues. Zinsser Gardz (B) is a water-based, clear drywall sealer in a 1-gallon size aimed at sealing damaged drywall and problem surfaces; it’s praised for fast drying and ease of application but noted as thinner than expected and may cause drywall tearing
Zinsser Gardz Water-Based Problem Surface Sealer, 1 gal
Water-based sealer for damaged surfaces that seals skim coats, wallpaper adhesive, and new drywall. Notable for fast-drying, clear finish, and easy application; user feedback mentions good adhesion and professional-looking results
Pros
- seals damaged surfaces
- easy to apply
- dries clear
- good adhesion
Cons
- mixed feedback on thickness
- some reports of drywall tearing
Flex Seal MAX 17 oz (2-pack) Black sealant coating
Waterproof rubber spray-on sealant that seeps into cracks and holes and dries watertight. Can be painted after drying; easy to coat, seal, and protect. Customers note easy application and effective sealing in some cases, with mixed views on value and durability
Pros
- easy-to-apply sealant
- dries watertight
- can be painted after drying
- seeps into cracks and holes
Cons
- mixed durability reports
- mixed spray quality and mechanism issues
- mixed leak prevention results
Head-to-Head
| Criteria | Winner |
|---|---|
| Price | Flex Seal |
| Durability | Flex Seal |
| Versatility | Flex Seal |
| User Reviews | Flex Seal |