Mixing instructions for marine and industrial coatings

Incorrect proportioning and insufficient mixing is the cause of 90% of the problems encountered with two component coatings. Please read all of this page before using our products.

Mixing epoxy coatings is a simple, straightforward job but if not done correctly the resulting sticky mess, or failed application will be an upsetting, expensive and labour intensive job to rectify.

This article has been written in an attempt to reduce the number of problems caused by customers who think that proportioning by volume with teaspoons, jugs and the like will produce good results.

Epoxy resins will set to some degree over a range of mix ratios but properties such as heat, water and abrasion resistance will be considerably reduced. Tensile strength and inter-coat adhesion will suffer and an excess of hardener will render the coating more likely to ‘bloom or blush’  Poorly mixed coatings have a patchy appearance, soon loose their gloss and pick up dirt.

The only way to guarantee that your application will provide the best long term performance is to follow these instructions.

MIXING Epoxy resins and hardeners must be thoroughly mixed in the correct ratios to ensure complete curing of the product. All REACTIVE RESINS coatings are supplied with the correct amount of hardener, all of which must be added to the can of resin and mixed well immediately before use.

Do not try to accelerate or retard setting of the material by varying the amount of hardener as this will cause the coating not to set at all, or to partly cure and prematurely fail.

Thorough mixing is also critical to the correct curing of the product and although small packs can be easily mixed by hand, a spiral mixer used in a pneumatic or cordless drill is essential for mixing larger packs. Ensure that the corners of small tins are well scraped with a flat stick in order to eliminate ‘dead’ spots of un-mixed material.

It is difficult, if not impossible to mix large cans of material with a power mixer without spillage, so after initially mixing the resin and hardener in the can pour it into another bucket and continue mixing. Using this method will ensure that the product is adequately mixed.

POT LIFE The pot life that is stated on the products data sheet will depend on the ambient temperature and is for small quantities. The pot life of large quantities will be much shorter due to the rise in temperature caused by the curing reaction. Pot life can be extended by pouring the mixed material into trays which will allow heat generated by the curing reaction to dissipate.

Do not mix more material than can be used within its pot life. If a smaller amount is required than is in a pack, the components must be accurately weighed in the proportions shown and on the product hardener label. Digital kitchen scales are ideal for this purpose. Mechanical scales are not suitable for small quantities.

Simply place an empty mixing pot on the scale, tare off the scale, pour out an approximate amount of resin. Calculate the amount of hardener required, tare off the scales again and accurately weigh in the hardener.

Proportioning by eye or by volume is not sufficiently accurate to achieve reliable results.

PLEASE REMEMBER that for good results you must proportion the components accurately by weight and mix thoroughly for several minutes.

Epoxy coatings must be mixed at a molecular level and an even colour is not an indication that the product has been sufficiently mixed.

Proportioning must be done by weight.   Do not proportion by volume.

Failure to follow these instructions will void the products guarantee.


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