TECHNICAL ANSWER
What is the material for Rocathaan Primer UNI-RW?
Polyurethane. Two-component, solvent-containing primer.
ROCATHAAN PRIMER UNI-RW · CORROSION PRIMER
Treat prepared exposed steel before the finish goes on.
UNI-RW is the rust-inhibiting primer stage for suitable prepared steel and corrosion areas where the cladding refurbishment specification calls for it. It belongs after mechanical preparation and before the protective finish — not over loose rust and not automatically over every elevation.
Type
2-component polyurethane primer
Primary role
Adhesion + rust inhibition
Pack sizes
5kg and 10kg sets
Typical consumption
100–250 g/m²
QUICK ANSWER 1
Do I need UNI-RW over the whole cladding elevation?
Not automatically. Its role is determined by substrate condition and the specification. Prepared exposed or corroded steel is a typical reason to use it.
QUICK ANSWER 2
Does UNI-RW stop cut-edge corrosion by itself?
It provides rust-inhibiting primer protection, but successful refurbishment also depends on removing defective material, preparing the steel and completing the specified coating build-up.
QUICK ANSWER 3
How much UNI-RW is used per square metre?
Manufacturer technical information gives 100–250 g/m². Actual consumption depends on the substrate and application.
QUICK ANSWER 4
Can it be used on aluminium?
Technical distributor information lists aluminium among compatible metal substrates, subject to preparation and specification.
PROBLEM → SOLUTION
Where UNI-RW belongs in a cladding refurbishment
Start with the defect, not the product name. That is the safest way to understand whether this system belongs on the job.
Prepared cut-edge corrosion
Relevant after corrosion and failed coating have been removed back to a sound steel substrate and the specification calls for rust-inhibiting primer.
Bare steel exposed during preparation
Can provide the primer stage before the protective finish where compatible and specified.
Recurring rust beneath old coating
Do not simply hide it. Diagnose why corrosion is active, prepare the steel correctly, then prime where required.
Sound retained factory coating
UNI-RW is not automatically required over every square metre; primer use follows substrate condition and the agreed build-up.
Perforated or materially thinned sheet
Not the answer. Primer cannot restore missing metal or structural capacity.
Unknown mixed metal substrate
Do not assume one primer route suits everything. Confirm preparation and compatibility for each substrate.
ANSWER IN 30 SECONDS
What is Rocathaan Primer UNI-RW?
Rocathaan Primer UNI-RW is Prokol's solvent-containing, two-component polyurethane primer with rust-inhibiting properties. It is intended as a strongly adhering primer on steel and other compatible smooth or slightly porous surfaces. In a cladding refurbishment it is particularly relevant after corrosion and cut-edge areas have been correctly prepared back to a sound substrate.
BEST FIT
prepared steel, exposed metal, cut-edge corrosion zones and compatible surfaces where the specification requires a rust-inhibiting bonding primer before the protective coating stage.
WHERE IT FITS IN THE JOB
1
Inspect & prepare
Identify corrosion, failed coating and exposed metal. Remove contamination and prepare the substrate to the project specification.
2
Prime where required
Apply UNI-RW to compatible prepared areas at the specified consumption rather than treating primer as a substitute for preparation.
3
Apply protective system
Observe the current product data sheet and overcoating requirements before the specified TopSpray 35 finish is applied.
Suitable uses & substrates
Prepared steel and metal surfaces
Smooth and slightly porous compatible substrates
Cut-edge corrosion areas after correct mechanical preparation
Can be spray, brush or roller applied where the current PDS permits
Do not use the product to hide the wrong problem
Do not apply to substrates highly sensitive to solvents.
Rust-inhibiting primer does not repair perforated or structurally failed sheet metal.
Compatibility, cleanliness and preparation must be confirmed before coating.
Consumption varies with substrate and application; do not turn a nominal rate into a guaranteed coverage figure.
TECHNICAL QUESTIONS & ANSWERS
Technical facts, answered in plain English.
Useful product data should answer a question, not sit in a wall of specification cards. These answers use the current technical information for Rocathaan Primer UNI-RW.
TECHNICAL ANSWER
What is the consumption for Rocathaan Primer UNI-RW?
100–250 g/m². Manufacturer technical information; surface dependent.
TECHNICAL ANSWER
What is the pack sizes for Rocathaan Primer UNI-RW?
5kg / 10kg. Whole two-component sets.
TECHNICAL ANSWER
What is the pot life for Rocathaan Primer UNI-RW?
Approx. 180 min at 20°C. Use current PDS for project control.
TECHNICAL ANSWER
What is the application temperature for Rocathaan Primer UNI-RW?
10–35°C. Object/substrate limits also apply.
TECHNICAL ANSWER
What is the application for Rocathaan Primer UNI-RW?
Spray / brush / roller. Follow current manufacturer application guidance.
REAL APPLICATIONS
See the sort of details this product is used on.
STRAIGHT ANSWERS
The questions people actually ask about Rocathaan Primer UNI-RW.
Do I need UNI-RW over the whole cladding elevation?
Not automatically. Its role is determined by substrate condition and the specification. Prepared exposed or corroded steel is a typical reason to use it.
Does UNI-RW stop cut-edge corrosion by itself?
It provides rust-inhibiting primer protection, but successful refurbishment also depends on removing defective material, preparing the steel and completing the specified coating build-up.
How much UNI-RW is used per square metre?
Manufacturer technical information gives 100–250 g/m². Actual consumption depends on the substrate and application.
Can it be used on aluminium?
Technical distributor information lists aluminium among compatible metal substrates, subject to preparation and specification.
PROBLEM-LED ANSWERS
What problem are you actually trying to solve?
The technical facts are already above. These answers start with the leak, defect or site condition so it is clear when Rocathaan Primer UNI-RW belongs in the solution — and when it does not.
My cut edges are rusting but the sheets are not perforated — what should happen before recoating?
The corrosion needs to be exposed, cleaned and prepared back to a sound substrate before the main coating is considered. Where the specification requires a rust-inhibiting bonding primer on the prepared steel, UNI-RW is the primer stage — it is not a substitute for removing loose rust, scale or failed coating.
I have bare steel showing after preparation — do I coat straight over it with TopSpray 35?
Not automatically. Prepared exposed steel may require UNI-RW before the protective finish, depending on the agreed build-up. The correct route is preparation first, primer where specified, then the compatible topcoat within the manufacturer's overcoating requirements.
Rust keeps coming back through an old coating — will another coat hide it?
No. Recurring rust usually means the corrosion source or failed coating beneath has not been properly dealt with. UNI-RW can form part of a corrosion-control build-up on prepared compatible steel, but coating over active loose corrosion is not a durable repair.
The cladding is badly corroded and thin at the edge — is UNI-RW enough?
No. A primer cannot restore lost steel thickness or repair perforated sheet. Material loss, perforation or structural weakness needs a repair or replacement decision before any coating system is specified.
Do I need UNI-RW over every square metre of cladding?
No. Primer use should follow substrate condition and the project specification. Prepared exposed or corroded steel is a typical reason to use UNI-RW; sound retained factory coating may follow a different preparation route.
I have mixed steel and aluminium cladding — can I use the same primer everywhere?
Do not assume so. Different metals and retained factory finishes can require different preparation and primer routes. Confirm compatibility for each substrate rather than treating UNI-RW as a universal answer to every metal surface.
RELATED QUESTIONS & TOPICS
Problems and applications connected to this system
cut edge corrosion primermetal cladding primerrust inhibiting primer for steelsteel roof primercorroded cladding treatmentprimer before cladding coatingindustrial metal roof primerRocathaan Primer UNI-RW coverageUNI-RW 5kgUNI-RW 10kg
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