Sandmar - FAQ's

Sandmar Products Australia Pty Ltd

8/26 Longstaff Rd
Bayswater, VIC. 3153

Phone: (03) 9738-0770
Fax: (03) 9738-0996



Aquepoxy® - FAQ's

Why should I use Aquepoxy® Concrete Floor Sealer? 

Aquepoxy® will not peel or flake, is hard wearing, solvent free and has very low odour making it suitable for application in most industrial and trafficable floors, food process and occupationally sensitive areas. Aquepoxy® is the most cost effective way to provide a safe, low maintenance workplace or public area whilst adding prestige and value to your investment.

Can Aquepoxy® be used on all flooring surfaces? 

Aquepoxy® Concrete Floor Sealer was designed for direct application to stable substrates such as concrete, masonry and brickwork. It also performs well on flooring grade particle board and plywood but is not suitable for application to polished surfaces or natural timber floors.

Can Aquepoxy® be used to level a rough or uneven concrete surface? 

Aquepoxy® is a medium build coating system designed for application to relatively smooth surfaces / concrete floors. Aquepoxy® is ideally suited to most factory, warehouse and workshop situations. Gives a consistent and attractive finish with excellent wear characteristics on a relatively smooth surface but does not level or repair rough and inconsistent floors. Aquepoxy® should not be confused with self-leveling seamless epoxy finishes that fall into a much higher applied price bracket of $40-50 per sq/mt and can be used to repair rough and uneven surfaces.

Can Aquepoxy® be used for exterior situations? 

All epoxy-based coatings chalk slowly when exposed to sunlight. Aquepoxy® sealers are formulated to minimize this degradation and will generally give better adhesion to exterior concrete than other systems. As a general rule, lighter colours can be used but we would not recommend Aquepoxy® Clear finish or darker colours for exterior use.

How long after concrete is poured can Aquepoxy® be applied? 

Fresh concrete floors can usually be coated after 14 days, depending on curing conditions. Allow a further 2 weeks if the floor has been curing at low temperature. No acid etching or other preparatory steps are needed, other than hosing off efflorescence and construction debris, then vacuum to remove surface dust and debris from sawcuts etc.

Can Aquepoxy® be applied to a wet concrete surface? 

Aquepoxy® is a water-based system and can be applied to a damp concrete surface, unlike solvent based and seamless and self-levelling finishes. Vacuum any ponded water, then Aquepoxy® can be applied to the damp concrete surface.

Does Aquepoxy® adhere to old unsealed concrete surfaces? 

Old concrete floors can often present adhesion problems for any coating or adhesive. Many coating systems do not adhere well to this highly alkaline surface. The top layer of aged concrete will gradually degenerate to an unsound powdery, dust-like surface, to which adhesion can be a problem. Soluble salts (efflorescence) often migrate to the surface, further hindering adhesion. Aquepoxy® sealers are extremely forgiving when applied to degraded concrete surfaces with excellent penetrating , binding and adhesion qualities and usually performs well even when applied to a low quality concrete surface. Aquepoxy® will not fix powdery, crumbling or otherwise defective floors but will usually perform well when other coatings fail. When in doubt, an adhesion test should always be carried out prior to application of Aquepoxy®. Diamond grinding may be required if adhesion is suspect.

Do I need to acid-etch older concrete floors? 

It is a common misconception that acid etching will remove existing coatings, oil and grease. This is not the case. Acid etching is designed to remove laitance (a weak, poorly-cured layer on a concrete surface as a consequence of excessive bleed water, often from over-trowelling). Acid etching can cause more problems than it solves if not carried out strictly in accordance with correct procedures and is generally not necessary, nor recommended, before the application of Aquepoxy®.

So how do I clean concrete floors contaminated with oil or grease? 

Aquepoxy® is relatively tolerant of contamination from oily materials. In areas of heavy grease, we recommend the use of a strong, hot detergent wash and high pressure clean. Follow up with clean, fresh water to remove all traces of detergent. Vacuum any ponded water then Aquepoxy® can be applied even when the surface is damp.

Will Aquepoxy® Sealer adhere to concrete curing membranes? 

There are three common classes of concrete curing membranes: PVA, chlorinated rubber and wax emulsions. PVA latex polymers, although the least effective as curing membranes, do not usually need to be removed before Aquepoxy® is applied. Wax-based curing agents, and chlorinated rubber-based systems in particular, must be removed before application of Aquepoxy® or indeed any surface coating or flooring adhesive.

Can Aquepoxy® sealers be used on previously painted surfaces? 

As a general rule, if the sealer or coating is wearing away and there is no evidence of peeling or flaking, it is usually safe to apply Aquepoxy®. However, some floor sealers (E.G. Polyurethane) and concrete curing membranes (see above) cannot be successfully recoated. You should always apply a small test patch of Aquepoxy® to any previously painted or suspect surface and check the adhesion after 48 hours before proceeding on a commercial scale.
Adhesion can be tested by cross-hatching the surface with a sharp blade, applying a strong adhesive tape, then removing the tape in a single, rapid motion. Traces of the coating on the tape will confirm relatively poor adhesion. Bear in mind that the overall adhesion will only be as good as the “weakest link” between coatings, or between coatings and the substrate.

What should I do if previous finish is peeling or adhesion test fails? 

A previously-applied coating showing any sign of peeling or flaking must be completely removed, usually by diamond grinding or similar treatment to provide a sound concrete base. Similarly, if your adhesion test fails, all traces of the previous coating must be removed and adhesion rechecked before application of Aquepoxy®.

How much Aquepoxy® sealer do I need? 

For two coat application (normal specification), one 25lt kit of Aquepoxy® will give coverage of 100-120 mt2 depending on the porosity of the surface.
For three coat application i.e. for R11/R12 slip requirement and high traffic areas such as toll booths / turning points in basement car parks or for extended warranty, one 25lt kit of Aquepoxy® will give coverage of approximately 70-80 mt2.

Can Aquepoxy® be diluted before use? 

Dilution is not usually recommended for roller application to ensure that the necessary film build is achieved. In some rare situations – and only when specifically recommended by Sandmar Products or its distributors, Aquepoxy® may be diluted for the remediation of very highly porous areas in concrete floors.

How long should I leave between Coats? 

The second coat can usually be applied as soon as the surface is dry enough to walk on, usually about four hours after the first coat is applied depending on drying conditions.

How do I prevent uneven gloss and sheen variations? 

These problems are usually caused by variation in texture (roughness) and/or porosity of the concrete surface. The first coat of Aquepoxy® seals the porous surface and allows the second coat to dry with minimal sheen variation. Some variation should be expected on particularly rough surfaces and additional coats will give improved uniformity.

During application, how do I minimize lap marks and wet-edge problems? 

Lap marks can occur when wet and dry layers are overlapped during application, resulting in visible areas of thicker film build. This is a common problem with clear and semi-transparent finishes when applied over large surface areas. Where possible, try to ensure that the edge of the applied coating does not dry before lapping-in with a layer of fresh coating. Aquepoxy® Sealer/finishes are formulated with long wet edge/open time properties to minimize this effect. Good application practice should always be followed to avoid lapping problems, for example by making use of saw cuts or expansion joints to break down a large floor area into smaller manageable sections.

Are there any special drying / curing requirements? 

Aquepoxy® Sealers are water based and exhibit very low odour, consequently ventilation is often ignored. It is important that water is allowed to evaporate and escape before curing of the epoxy binder occurs. Applicators should encourage air flow across the floor to avoid pockets of moisture vapour settling on the floor and suppressing evaporation. Open doors and use a fan to assist air flow across the floor,  especially for application in small or confined areas. Try to avoid application of Aquepoxy® when humidity is high.

Can I increase Aquepoxy gloss level? 

Aquepoxy® sealers are formulated to give a low sheen finish. A gloss finish can be achieved by application of an additional coat of Aquepoxy® Clear Gloss but this will downgrade slip resistance (especially when the floor is wet) and is not usually recommended or encouraged.

Can Aquepoxy® Sealers be applied to vertical surfaces? 

Aquepoxy® has been applied to concrete, masonry and brick vertical surfaces with very good results. However, Aquepoxy® sealers are primarily  formulated for high-build application and controlled flow on horizontal surfaces, so minimizing the effects of substrate variability. For application on walls and other vertical surfaces, Aquepoxy® should be applied at 14-16 mt2/litre to avoid sagging. Line White, Off White and pastel colours are not recommended for application on vertical surfaces.

Are Aquepoxy sealer/finishes slip resistant? 

Slip hazard resistance is a critical performance characteristic, and Sandmar Products have invested considerable research into the development and accreditation of Aquepoxy® as a slip-resistant finish. Please click on the “Slip Resistance” button on the left menu to view more information.

How long will my Aquepoxy sealer/finish last? 

Aquepoxy® is a hard wearing, two-pack epoxy coating. Epoxy coatings are recognised as being amongst the toughest and most abrasion resistant coatings available. Any coating will eventually wear through via abrasion. The three factors determining how long the coating will last are the coating film thickness, the degree of abrasion the coating is subjected to and of course, the quality of the coating.
When applied over sound concrete and subject to light foot traffic, Aquepoxy® would be expected to last many years, even 10 years or more in light traffic areas. The lifetime of the coating will be reduced in areas of highly abrasive, frequent traffic such as car park entrance and toll gates, forklift doorways etc. and may require periodic recoating in these areas.
Aquepoxy® is a registered trademark of Sandmar Products Australia Pty. Ltd.

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