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House Paint versus Marine Paint?

A perplexing question for many consumers, whilst others believe that a marine paint has to endure a harsher climate and therefore it must be better. However, in some cases it’s just a matter of dual-branding. In other words, a “house paint” in another label (which is particularly true where the manufacturer also makes house paints).

The reality is this. A true marine paint starts out by sourcing the best grades of resin on the market. These are chosen for their weathering capability, flexibility and toughness. House paint resins on the other hand are selected for their price, as this market is acutely competitive and the quality has to be compromised if any sales are to be gained.

To illustrate the construction of paints, it can be mainly segmented into three component areas, solvents – resins – pigments/extenders. The manufacturers aim is to use cheaper resins and minimize the volume used per batch, as this is the greatest expense. Bearing in mind, that it is solely the resin that has adhesive value. Solvents and extenders have no sticking potential.

By minimising the resin value and increasing the extenders the mixture is overly thickened, which means increasing the solvents to get the right consistency. The finished weight of the product remains similar to other products, but by increasing the solvents the shrinkage is greater. Put a bucket of turps outside and it will all eventually evaporate. If there is 25% solvent in that tin of paint then the coating has to contract by that corresponding value.

The other distinction to paint manufacture is whether or not the company grinds its own pigments into the product, or just out-sources subcontracted emulsions. The latter are normally based on dry pigments ground into a solution of surfactants (detergents). This means that they are compatible with solvent based, and water based coatings. Again, the use of surfactants renders the coating compromised because detergent has no integrity in the paint film and weakens the structure.

At NORGLASS, our policy is to use the best grades of resins and then blend them to maximize their values. Next we select the best u/v stable pigments and mill them to a micro-fined state during manufacture. We then minimize the filler/extenders so that we can increase the ratio of resins. By doing this we then have a substantially lower addition of solvents, and longer lasting performance due to the high resin loading. This dedication to producing the best quality paint means by paying a little more at the counter, the consumer gets value for money by longevity. Regardless of whether it’s the house or the boat.

Les Baker, Managing Director

Posted Wednesday April 30, 2014    Tags: