Polyvine Heavy Duty Extreme Varnish (Strongest Top Coat)




This is the product I have been waiting for.  I wanted a product that you could use over any color paint and not have to worry about “clouding” and also one that would give a super durable finish.  This is my top coat of choice for those super heavily trafficked surfaces such as kitchen cabinets, table tops, floors etc.  This product is also a great choice for sealing chippy milk paint too.
The strongest of all ‘one pack’ varnishes that dries in minutes and cures in 16 hours to
interior and exterior surfaces
New water-based crosslinked polyurethane with advanced resin technology brings the
highest protection single pack ever developed. UV blocking and absorption reduce
greying, aging and deterioration of surfaces. Biocides protect against mildew, mould and
wood • marine • worktops • doors • furniture • concrete paving • unglazed tiles • slate •
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  (TSP) 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. Heavy Duty Extreme 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 Heavy Duty Extreme Varnish can draw certain
stains through the paint which were not otherwise visible. In this case a stain sealer
should be used.
Heavy Duty Extreme Varnish can be applied by brush, spray or roller. Apply 2 or 3 coats.
On softwood, light sanding in between coats may be necessary, if there is any raising of
the grain. Allow 2 hours in between coats and 24 hours after final coat before full use. Do
not use in temperatures below 5 degrees C/40degrees F or in very high humidity. Lower
temperatures will slow the final cure time. On new softwood and porous surfaces dilute
the first coat 10% with water. Lightly sand wood in between applications to remove any raising of the grain.
Dead Flat finish
For increased durability and stain resistance first apply 2 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.


The open grain texture of Oak will cause film failure. Varnishes are prone to failure when applied to Oak externally.
It is imperative that the grain is filled with coating before further coats are applied.
Oak is not as resistant to weathering as oily hardwoods and, therefore, needs better
protection when used outdoors. The large open pores make the problem worse providing
a route for water-ingress. Blue-stain mould spores are likely to be present on any piece of
timber and will be activated by moisture. Another problem with Oak is the high tannin
content, if not properly sealed water (rain) can wash the tannin out o
f the wood leaving a patchy colour and staining to the surrounding areas (bricks, patio, etc.).
Pre-conditioning to the correct moisture content is very important. If the Oak is outside
the moisture content range of 12-20% there will be excessive movement as it comes to
equilibrium. The wood can become split, and the coating film may also split exposing
bare wood, providing a route for water-ingress and rapid deterioration of the coating.
If this occurs remedial action must be taken immediately to prevent the wood becoming
weather-stained. Clean the surface and reapply sufficient coats of the same coating
product to fill the cracks/splits.
The coating integrity cannot be guaranteed on green oak.
Intense exposure to sunlight will cause gradual fading of the timber colour. A
pretreatment of Polyvine Wood Colour is recommended in these areas to enhance the
timber colour and prevent fading. Application to softwood, knots and resin pockets will bleed through the coating.
Inspect yearly for signs of wear or damage.
Clean surface thoroughly and wash off all cleaning solution.
A maintenance coat should be applied every 1 / 3 years on exposed areas, 3 / 4 years on
less exposed or sheltered areas.
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
Previously painted wood
Completely remove old coating with 60/80 grit sandpaper.
Ensure surface is dry clean and free from dust, follow New and weathered wood
Fill all joints, Cracks, and nail holes with a good
quality Polyurethane or acrylic filler
prior to coating.
coverage 10-20 sq m per litre, 100-200 sq ft per quart
drying time
re-coat time
1-2 hrs
cure time
16 hours in ideal conditions. Allow 48 hours before heavy use eg. furniture
dragging, and several days before covering with carpet.
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.
DRY FILM: Satin, Dead flat
DRYING TIME: approx. 30 minutes @ 20degrees C / 70degrees F
CURE TIME: approx. 16 hours @ 20degrees C / 70degrees F
HARDNESS: approx. 150 sec Konig hardness
BHMR: excellent @ 16 hours
NON YELLOWING RESISTANT TO: Water, tea, coffee, alcohol, detergent, wet hot pans, etc.


1L, 4L. US Quart, US gal.
Plastic containers.
Store in unopened container in a cool dry place away from direct sunlight.
Non-hazardous. Ensure good ventilation. Keep out of reach of children. Contact with
eyes – wash immediately with warm water. Remove excess from tools and mixing vessels
before washing in warm soapy water. Do not empty containers into drains or watercourses.

Additional information


Dead Flat 100 ml (3.52 oz), Dead Flat Quart, Satin 100 ml (3.52 oz), Satin Quart