Master Builders Solutions — Bituminous coatings & membranes
MasterSeal 621
A product name historically used in bituminous waterproofing ranges.
- Bituminous coatings & membranes
- Foundations
Verify before you specify
A historical, regional or rebranded name. Do not treat it as a current product until it is verified.
Check the current manufacturer technical data sheet for this product and market.
What it is
Legacy/regional bituminous waterproofing name.
A product name historically used in bituminous waterproofing ranges.
Source note: Legacy/market-dependent; verify. MasterSeal and Sika names correspond only in some markets; they are not interchangeable.
Where to apply
Only foundation/building-envelope applications confirmed by the exact TDS.
Application overview
- Follow the specified primer and coating/membrane process.
- Protect the cured system before backfilling or covering.
High-level steps only. Mixing, coverage, thickness, timing and curing come from the current data sheet.
Technical controls
What the applicator must check before and during the job:
- Formulation (water/solvent based)
- Substrate moisture
- Thickness
- Cure
- Protection
Official documents
- Manufacturer reference page
- No data-sheet library is linked for this brand yet. Check the current manufacturer technical data sheet for this product and market.
The library may be a regional site. Confirm the data sheet matches the product and market you are buying.
Image and source status
Product image supplied from the manufacturer's published material.
Disclaimer
Check the current manufacturer technical data sheet for this product and market. Installation must follow the current TDS/SDS and the project specification.
More in this category
Sika
Verify locallySika Igolflex R
A flexible bituminous coating used in suitable waterproofing/protection systems.
- Bituminous coatings & membranes
- Foundations
Sika
Current familySikaShield family
Product family — choose an exact grade
A family of membrane grades with differing reinforcement, finish and installation method.
- Bituminous coatings & membranes
- Foundations
- Roofs
Sika
Verify locallySikaBit PRO-45
A specific membrane grade whose construction and installation method must be checked in the current TDS.
- Bituminous coatings & membranes
Not sure this is the right product?
Construction problems are not always solved by choosing a product from a catalogue. Tell us what you're working on, what problem you're experiencing, and what surface or structure is involved — we'll help you identify the appropriate solution.