
About the product
Aguaplast Masilla de Estanqueidad is Beissier's elastic, waterproof sealant based on nitrile rubber reinforced with fiberglass — the product in the range for repairs and waterproofing where water is the main problem. With high elasticity between -30°C and +80°C, it adheres to concrete, cement, stone, tile, wood, metals, glass, PVC, and asphalt felt, and can even be applied underwater. Touch dry in 15 minutes, fully cured in 12 hours. 1 kg metal can.
What uses and surfaces is it ideal for?
- ✓ Repair and waterproofing of cracks and fissures in terraces and roofs
- ✓ Sealing of gutters, downspouts, and water pipes
- ✓ Waterproofing of tanks, ponds, and swimming pools — suitable for underwater use
- ✓ Joints between different materials — metal, plastic, stone, wood
- ✓ Repairs on asphalt felt, zinc, and galvanized steel
- ✓ Areas with permanent humidity where other sealants fail
Why choose Aguaplast Masilla de Estanqueidad
- ✓ Nitrile rubber — no asphalt or bitumen — unlike conventional black bituminous sealants, nitrile rubber does not soften with heat or harden with extreme cold; it maintains its properties between -30°C and +80°C
- ✓ Applicable underwater — one of the few sealants that allows repairing cracks in swimming pools, ponds, and tanks without completely emptying their contents; especially useful for urgent repairs
- ✓ Reinforced with fiberglass — the fiber acts as internal reinforcement that prevents the putty from cracking or tearing under tension; especially important in expansion joints and areas with movement
- ✓ Surface dry in 15 minutes — allows for quick work on urgent roof, gutter, and terrace repairs before rain
- ✓ Allows occasional traffic once cured — after 12 hours of full curing, the repaired area on terraces and flat roofs can withstand occasional foot traffic
Compatible substrates
How to apply — in 4 steps
- Prepare the crack: open in a "V" shape, brush, and remove dust and loose parts. On very porous substrates, prime with the same product diluted 30% with nitro solvent.
- Apply with a brush or spatula, introducing the material into the fissure and avoiding air pockets. Spread in excess with a 5 cm margin on each side of the crack.
- Thickness of 1 to 3 mm per layer to ensure bridging. For greater waterproofing, apply several crossed layers, waiting 15 minutes between each.
- Allow to cure for 12 hours. Clean tools with nitro solvent immediately after use.
Do not apply on expanded polystyrene (EPS). Do not use in unventilated spaces.
Technical specifications
| Product type | Elastic waterproof sealant based on nitrile rubber |
| Color | Grey |
| Use | Exterior and interior — wet works |
| Thermal range | -30°C to +80°C |
| Surface drying | 15 minutes |
| Total curing | 12 hours |
| Application | Brush · Spatula · Cold |
| Thinner and cleaning | Nitro solvent |
| Coverage | 1 kg/m² |
| Format | 1 kg (metal can) |
Attention — solvent-based
This product is nitro solvent-based — do not apply in enclosed spaces without ventilation. Do not apply on expanded polystyrene. Application temperature between +5°C and +40°C.



















