- Galvanised Steel System
- Prep Treatment
- Bastion Industrial
Bastion T Wash Mordant Solution
4.7 from 3 customer reviews£34.00
inc. VATSKU: bastion-t-wash-mordant-solution
Step 1 of 3. Converts surface zinc salts on new galvanised steel — required before any primer will properly key to the surface. Never skip this step. Coverage: 10 m²/L (approx., single conditioning coat).
Key specs at a glance
- Substrate
- galvanised steel
- Role
- Prep Treatment
Free UK delivery over £60 · Free 30-day returns
Order by 2pm — estimated delivery Fri 18 Sept
Not sure it's the right one for your job? Read our paint help guide — substrate, condition and application explained.
About this product
Step 1 of 3. Converts surface zinc salts on new galvanised steel — required before any primer will properly key to the surface. Never skip this step.
Technical specification
- Role
- Prep Treatment
- Substrate
- galvanised steel
- Category
- Galvanised Steel System
- Brand
- Bastion Industrial
- Application method
- brush
- Pack sizes
- 1L
Where this fits in the prep sequence
- Bare / new substrateRequired first step
- Previously painted, sound surfaceNot usually needed
- Used as a standalone finishNot suitable
Is the Bastion T Wash Mordant Solution right for your job?
The Bastion T Wash Mordant Solution is a prep treatment built for galvanised steel.
This product suits you if
- You're painting galvanised steel
- The substrate is bare/new and hasn't been treated yet
Check before you buy if
- Your substrate or environment doesn't match the product description — check the prep guide
Application — how does it go on?
- Role
- Prep Treatment
- Application method
- brush
Check the pack for the recommended application method.
— The Paint Guys prep note, based on 3 customer reviews
Customer reviews
Three-step kit did exactly what it said — the Bastion T Wash Mordant Solution finished it off with a durable, even coat.
Helen K.
Verified purchase · 5 Sept 2026
Followed the T Wash → primer → topcoat sequence exactly and the Bastion T Wash Mordant Solution hasn’t lifted off the galv gates once.
Jordan M.
Verified purchase · 27 Aug 2026
Skipped painting galv for years assuming it wouldn’t hold — this system, including the Bastion T Wash Mordant Solution, proved me wrong.
Aisha B.
Verified purchase · 18 Aug 2026
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