Natural Wall Filler – Graphenstone MinerMastic Mineral Defects Filler

£20.00 Inc VAT

GRAPHENSTONE PAINT Graphenstone Minermastic Natural Wall Filler

Natural Wall Filler – Mineral renovation filler 750ml (equiv)

MinerMastic Premium is a mineral renovation filler to repair surface defects. Apply to fill small defects such as cracks, small holes and superficial fissures (1-3 mm) and to smooth rough surfaces, large surface defects, and repair chipping of existing paint. For interior and exterior application.

Comes as powder, just mix with water.

600-700 g/m2 (1mm of thickness)


PERFORMANCE 0.6-0.7 kg/m2
DRYING 24 h (total drying)
APPLICATION TOOLS Spatula or trowel.
USE Interiors and exteriors under roof


Repairs superficial defects.
Fill plate joints.
Smooth rough surfaces.
It regulates great superficial defects.
Excellent texture and adhesion.
Easy application and good sanding.
High strength and durability.
Does not crack.
Suitable for interiors and exteriors.
Free of emissions VOCs and formaldehydes.

Technical properties:
Apparent density: 1.5 ± 0.05 g/cm3 pH 12.5 ± 1 Solid content 72 ± 5 %
Appearance: Dense white paste
Yield: 600-700 g/m2 (1mm of thickness). It depends on the type and condition of the substrate. The exact consumption must be determined by the means of a sampling of the work.
Storage: Keep in original pack, closed and in a cool and dry place. Keep from freezing and avoid direct sun exposure. Unopened, it may be conserved for at least 36 months from the date of manufacture.

Application surfaces: It can be applied on all types of surfaces common in construction: mortar, concrete, plaster, prefabricated boards, etc.
Conditions of the substrate: The substrate must be dry, firm, well-adhered and free from any impurities that may hinder the product from setting fully. Preparation of the substrate: If the substrate presents algae, mould, fungi and / or other impurities, it is recommended to do a thorough cleaning, eliminating in its entirety and with specific products for this purpose. If the support has poor adhesion (gritty, dusty, etc.), brush and consolidate with Minerseal Premium diluted 3: 1 with water. If the substrate has salt deposits, brush and apply Neutralysal Premium.
Preparation of the product: Mix the product and gradually add water to 30-35% by weight of the product until a smooth and uniform texture is obtained.

Application method:

Superficial defects: fill in the surface defect and/or union between plates. Place a 2 mm grid fiberglass mesh for joints and surface bricks greater than 1 mm. Finally, regularize the substrate by applying 1-2 layers and when dry sand it.
Smooth surfaces: apply 2-3 layer properly extending the product. After drying, sand and brush. Working thickness: <3 mm. Drying: In conditions of 25 ºC and 60% relative humidity: 24 hours between layers and for sanding.
Environmental conditions: The work temperature (environment and support) must be between +5 °C and +32 °C. Do not apply in direct sunlight or on substrate heated by the sun.

Tools: Spatula or trowel.
Tool cleaning: Clean tools after use with warm water.
Notes: The mineral substrate must be at least 28 days old. The substrates to be treated must be resistant to high alkalinity. Do not apply to surfaces in constant contact with water. In case of rain, let the substrate dry for at least 24 hours before applying. It is recommended to protect the treated surface from rain until painting. The parts that are not going to be treated must be protected (glass, wood, etc.). Do not mix with other products or specific properties may change.

Additional information

Weight 1.15 kg



Order time cutoff is 11am. Orders arriving after that will be processed next working day
Colour Charts: FREE Delivery.
1-2 Day (Usually, but not guaranteed Next Working Day): 0-1 kg - £3.95 (Up to 8 tester pots)
1-2 Day (Usually, but not guaranteed Next Working Day): 1-2 kg - £7.95 (750ml Pot, or a 1L pot)
1-2 Day (Usually, but not guaranteed Next Working Day): 2-20kg - £12.50
1-2 Day (Usually, but not guaranteed Next Working Day): 21-40kg - £22.95
40kg+ Please note, large orders that include big tubs may need to be sent on a pallet, so may be 1-2 working days.

Sample / Tester Pots

We offer 2 types of tester pots on most products on all pages (in the drop down box)
1) ‘Colour Tester 100ml – (Standard colour matched pot for all Graphenstone paints)’ £4.99 per tester pot. We use our premium grafclean paint to offer sample pots in all colours we offer. The colour of this tester is exactly the same as the colour in the other paint ranges, which is why we offer it as a standard tester pot (as it’s cheaper as we can use this one paint for all colours). We mix this per order.
​ 2) ‘Colour Tester 100ml – (In this specific paint to test texture or sheen)’ £7.80 per tester pot. For people who want to check the exact paint, we also offer a tester pot in the actual paint (for people who want to check texture / consistency) as the colour is exactly the same as the standard tester pot.

Large orders of big tubs will need to be sent on a pallet, so may be +1-2 working days.


All Next day:
1 bag - £8
2 bags - £14
3 bags - £21
4 bags - £28
5 bags - £35

ECO PACKAGING: Testers use bio degradable corn starch infill packing pieces (these are only suited to testers and very light weight items though); on larger products we either use recycled/recyclable brown paper or we’re just starting to use pulped cardboard inserts for 2.5l and 5l tins - these are recycled and can either be recycled with household cardboard, composted or several people use them as firefighters!

Add products to basket and click estimate shipping to see costs.

All weekend orders are processed on Monday morning. We always advise trying a tester pot first.

* Postal Surcharges: Channel Islands, Isle of Man, Isle of Wight, Highlands & Scottish Isles incur a surcharge. These surcharges are set by the couriers and not by ourselves! Our standard pricing (graphic, pricing) is for mainland England only, with above modifiers. All orders placed after 11am are processed morning of the next working day. Standard delivery is 3-4 working days.

Please Note: All products (paints / finishes / oils / waxes etc) are held in white and clear only, everything else is hand coloured specifically to your order (when you select from a colour range) by our wonderful mixing team, so unfortunately cannot be returned. Please please please try a tester pot first beforehand!

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