The short answer
When people search for liquid rubber certification, they are usually mixing together three different things: documentation for the product itself, whether the contractor is recognised by the manufacturer as an approved applicator, and whether a specific installed system qualifies for manufacturer-backed guarantee documentation. Those are related, but they are not the same thing.
Williams & Co Paint Contractors is an approved applicator and authorised reseller of Rubber Sealant® Liquid Rubber. That status matters because it connects the contractor doing the work to the manufacturer whose system is being specified. It does not mean every job automatically receives the same guarantee or certification outcome.
1. Product documentation is not installer certification
A waterproofing product can have technical data sheets, application instructions, safety information and manufacturer specifications. Those documents describe the product and the conditions under which it should be used. They do not prove that the contractor applying it has been approved by the manufacturer, and they do not prove that a particular installation was carried out to the required system specification.
- Product documentation tells you what the material is and how the manufacturer says it should be used.
- Approved applicator status tells you whether the manufacturer recognises the contractor for that product system.
- Project documentation tells you what was actually specified and installed on your property.
- Guarantee documentation tells you what is covered, for how long, and under which conditions.
2. What approved applicator status means
An approved applicator is a contractor recognised by the product manufacturer to apply its system. For a property owner, that is a stronger signal than simply seeing the product name on a quotation, because it establishes a direct relationship between the installer and the manufacturer.
Williams & Co is an approved applicator and authorised reseller of Rubber Sealant® Liquid Rubber. We use that wording deliberately. We do not describe ourselves as a Plascon approved applicator, because we are not one. Plascon is our preferred paint on many projects, which is a different claim.
3. A 13-year manufacturer product guarantee is not automatic
A homeowner should therefore ask for the actual guarantee terms that apply to the proposed system, not rely on a large number in an advert. The substrate, system specification, application method, inspection requirements and maintenance conditions can all affect whether the manufacturer product guarantee applies.
4. Manufacturer guarantee versus workmanship guarantee
| Document | Who stands behind it | What it generally relates to |
|---|---|---|
| Manufacturer product guarantee | Product manufacturer | Qualifying product/system performance subject to the manufacturer's stated conditions |
| Workmanship guarantee | Installing contractor | Qualifying workmanship carried out by the contractor |
Williams & Co provides a one-year workmanship guarantee on qualifying Williams & Co work. That is separate from any manufacturer product guarantee attached to a qualifying Rubber Sealant system. Keeping those two guarantees separate makes it much clearer who is responsible for what.
5. What to ask for before accepting a liquid rubber quotation
- 1The exact product and system being specified, not simply the words 'liquid rubber'.
- 2Confirmation of the contractor's relationship with the manufacturer where approved-applicator status is being claimed.
- 3The substrate and preparation requirements for that specific surface.
- 4The number of coats or required system build stated in the specification.
- 5The written manufacturer guarantee conditions that would apply if the project qualifies.
- 6The contractor's separate workmanship guarantee and its exclusions.
- 7The documents you will receive at handover, including product and guarantee paperwork where applicable.
6. Why this matters on real Cape Town roofs
Two contractors can both write 'Liquid Rubber' on a quote and still be offering materially different jobs. One may be pricing a defined manufacturer system with the correct substrate treatment, detail work, coat build and documentation. Another may simply be applying a flexible coating and using the product category as the headline.
The useful comparison is therefore not only price per square metre. Compare the specification, the applicator status being claimed, the written guarantee conditions, the number of coats, what happens at bolts, laps, cracks and penetrations, and what documentation you receive at handover.
The simplest way to verify the claim
If a contractor says they are an approved applicator, ask which manufacturer has approved them and ask for that status to be confirmed. If they advertise a long product guarantee, ask to see the actual manufacturer terms before the job starts. If the contractor cannot separate product documentation, applicator status, project certification and workmanship cover, the word 'certified' is not giving you much useful information.
Common questions
No pressure
If you would like a second opinion on your own property, we will come and look.
The inspection is free, you get the findings in writing with photographs, and you are under no obligation to do anything with them.