Water Based Polyurethane:
Unlike SOLVENT-BASED POLYURETHANE, the polymer is floating in a water based solution instead of chemicals. There are varied combinations within the water-based polyurethane category including acrylic-polymer blends. As per solvent-based, usually three coats are required and the durability ranges, depending on the product, from low wear to arguably as durable as solvent-based.
Some of the harder two-pack water-based polyurethanes can still cause edge-bonding, but it is less likely. They will not yellow over time, but can darken somewhat, and are considered a more natural look, while still providing a polyurethane “film-build” wear quality. They are also less susceptible to rejection or contamination from the natural saps and oils in the timber.
Edge-bonding is not an issue with this type, although some of the harder two-pack water-based polyurethanes can bond in joins and stretch when movement occurs, forming a pale line.
Of course, the main advantage of these coatings is their being a much healthier and more environmentally considerate option, having no strong chemicals or odours upon application. They are, however, a higher cost than solvent-based and this will be reflected in a contractor’s overall charges.
Recommended dry time 1-4 hours, 7 day full cure. Average costs for product $140-$250/5ltr
Solvent Based Polyurethane
SOLVENT BASED POLYURETHANE provides the highest gloss option for those who desire a shiny timber floor, with subdued gloss options if required. They will yellow over a period of time, which can be undesirable. Solvent-based Polyurethanes are the most durable and hard-wearing of all coating categories. Due to their strength, some two-pack Polyurethanes can “glue” the floorboards together, causing a problem known as edge-bonding. They are also susceptible to rejection or contamination from the natural oils and saps in timbers. This must be taken into account when coating exotic species such as Brush Box or Spotted Gum..
They have strong solvents and high levels of toxicity, including an isocyanate content. The contractor is required to wear protective respiratory equipment.
Mineral Turps based Tung oil and Oil Modified Polyurethane:
Common reasons for use are ease of application and timber movement tolerance. Dries by evaporation and conditions the timber. Unfortunately Oils do not offer much protection, however they are easy to touch up scratches, which is good as you will be creating quit a few of them. Although less toxic than Moisture cure, they are not without harmful vapours. Recommended dry time 8-12 hours, full cure 28 days. Average costs for product $65-$80 10ltr Drum
