Polyvine Heavy Duty Extreme Varnish


Polyvine Heavy Duty Extreme Varnish is a new water-based crosslinked polyurethane with advanced resin technology brings the highest protection single pack varnish ever developed. UV blocking and absorption reduce greying, aging and deterioration of surfaces. Biocides protect against mildew, mould and fungus.

  • Dries in minutes and cures in 16 hours to protect interior and exterior surfaces
  • For interior wood, worktops, doors, furniture, marine, concrete paving, unglazed tiles, slate, brick and flagstones

£30.75(ex. VAT)
£36.90 (inc. VAT)
Please choose your colour
In Stock and Available for Delivery (See Delivery Options Below)


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Features & Benefits

  • Areas of use:
    • Interior wood, wooden floors and wood panelling
    • Worktops
    • Doors
    • Furniture
    • Paintwork
    • Marine
    • Porches and fascias
    • Concrete paving
    • Unglazed tiles
    • Slate
    • Brick
    • Flagstones
    • Where high water and UV resistance is requiredk
  • Water-based crosslinked polyurethane varnish
  • Advanced resin technology
  • Strongest of all ‘one pack’ varnishes
  • UV blocking and absorption reduce greying, aging and deterioration of surfaces
  • Waterproof for ultra-tough protection in extreme weather conditions
  • Biocides protect against mildew, mould and fungus
  • Cures in 16 hours for an industrial-level finish

Resistances to: Polyvine Heavy Duty Extreme Varnish (pure pu) Brand Leader Varnish (pu/ac) Acrylic Varnish Spirit Based Varnish (pu)
Ethanol 5 4 0 4
Tea 5 4 3 4
Coffee 5 4 3 4
Detergent 5 4 1 4
Hot wet pan 5 3 0 4
Other Properties:
Non-Yellowing 5 4 5 2
Hardness 5 4 2 4
Clean Up 5 5 5 0
Time to full cure (50% rh. 20 Degrees C) 16hrs 48hrs 48hrs 48hrs

0 = Poor 5 = Excellent

Surface Preparation

Building materials

Clean the surface.

To ensure that the Polyvine Extreme keys, the surface must firstly be cleansed of all moss, mould, lichen, carbon deposits, oil stains and airborne dirt. Thoroughly wash the paving using a pressure washer, ideally with an output pressure of 2500 to 3000 psi and a spray lance equipped with a “turbo‐jet” nozzle or specialist rotary attachment designed for cleaning paved surfaces. Alternatively, the surface can be cleaned manually with a max strength patio cleaner and a stiff bristle deck scrubbing brush. Allow to dry.

After cleaning (once dry) the paving should be thoroughly sprayed with Biocidal Wash Treatment. This is applied by low pressure sprayer (as for weed killer etc.) to the entire paving surface and is left to dry out (do not rinse). This is an extremely important phase in the process because it will greatly reduce the possibility of moss or lichens re‐establishing. The pressure washing process leaves the paving looking clean but the moss root systems and mould/lichen spores are still present in hundreds of microscopic crevices and especially in the joints. Spraying the paving ensures that the paving is sanitised and inert.

Note: Some paving materials occasionally exhibit corrosive efflorescence (salting) and where this occurs it can cause coatings to de‐laminate.


Ensure the surface to be coated is clean and free from grease, wax or polish. White spirit or sugar soap should be used as cleaning agents. Sugar soap should be rinsed off well with clean water and allowed to dry. If water has been used on bare wood this would raise the grain. The surface then needs to be sanded and vacuumed before coating. Newly painted wood should first be sanded to provide a key. Extreme Heavy Duty Varnish should not be applied over uncured oil base paint as this may cause discoloration. Older painted wood, where the paint itself may fail, should be stripped using a hot air gun or a chemical paint stripper, sanded and cleaned prior to coating. When applied over an emulsion/latex paint, it is possible that Extreme Heavy Duty Varnish can draw certain stains through the paint which were not otherwise visible. In this case a stain sealer should be used.

Oily Hardwoods (Iroko) and Oak

The open grain texture of Oak will cause film failure. Varnishes are prone to failure when applied to Oak externally and Oily hardwoods like Iroko. It is advised to apply Wood Oil.

The coating integrity cannot be guaranteed on green oak.

New and weathered wood

New wood can be contaminated during preparation, or in the machine shop. Weathered wood can already have contaminants on the surface. All contaminants and millwork must be removed from the surface by sanding, 80/120 grit for vertical, 60/80 grit for horizontal surfaces. Fungus, pollen or spores not removed and trapped below the clear varnish will discolour the surface of the timber when exposed to moisture. If contamination is suspected treat timber with a proprietary preservative treatment as recommended by the manufacturer.


Fill all joints, Cracks, and nail holes with a good quality Polyurethane or acrylic filler prior to coating.


Extreme Heavy Duty Varnish can be applied by brush, spray or roller. Apply 3 coats. Allow 2 hours in between coats and 24 hours after final coat before full use. Do not use in temperatures below 10 degrees C or in very high humidity. Lower temperatures will slow the final cure time. On porous surfaces dilute the first coat 10% with water. 10-20 sq m per litre coverage.

Dead Flat Finish - For increased durability and stain resistance first apply 3 coats of Heavy Duty Extreme Varnish
Satin followed by 1 coat of Heavy Duty Extreme Varnish Dead Flat. This will result in a slightly brighter finish than
using Heavy Duty Extreme Varnish Dead Flat only.

Any equipment used can be cleaned using soap and water before the clear coat dries. Wipe any excess off surfaces with a damp cloth. Any dried deposits will need a paint stripper to remove them.


  • Always apply to a test area before starting work
  • Appearance may vary according to the colour and type of wood and the number of coats
  • Do not apply over uncured oil paints
  • Apply dead flat finish sparingly and brush out well, over application could result in misting
  • Test dead flat finish for misting over dark colours.

Product Details

Data sheet

For Use By
Consumer Use
For Use By
Industrial Use
For Use By
Professional Use
For Use On
Interior wood, worktops, doors, furniture, marine, concrete paving, unglazed tiles, slate, brick and flagstones
Application Method
Brush roller, spray
Dead Flat, Satin
Single, Two or Three Pack
Single pack
Pack Size
1L, 4L
10-20 sq m per litre
Drying time
30 - 60 minutes
Dry to Recoat
1 - 2 hours
Fully Cured
16 hours in ideal conditions. Allow 48 hours before heavy use eg. furniture dragging, and several days before covering with carpet.
Base Type
Suitable For Use On
Suitable For Use On
Suitable For Use On
Garden Furniture
Suitable For Use On
Suitable For Use On
Suitable For Use On
Suitable For Use On
Application Method
Application Method
Application Method

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

questions Joe on 2022-11-30 23:25:05

Can this be used on recently painted kitchen worktops?

Answer from Rawlins’ Technical Team: 

Assuming the paint used is waterbased, it is fully cured, clean, dry, sound and prepared as detailed in the technical data sheet it could be used. 

But we would recommend testing on a small area prior to full application for compatibility and adhesion.

Question about the product

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Polyvine Heavy Duty Extreme Varnish is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT