Here are some of the main ones: Exposure to weathering: Prolonged exposure to the sun's UV radiation, temperature variations, humidity, weathering and other atmospheric agents can affect the durability of polyurethanes.
Bubbles and streaks can ruin the smooth finish of your polyurethane floor. To avoid bubbles, make sure to stir the polyurethane gently and avoid shaking the can. When applying, use a high-quality brush or roller and apply thin, even coats.
There are a handful of chemicals that can remove polyurethane. They include: Isopropyl alcohol. Acetone.
Even though polyurethane is waterproof and weatherproof, if it's left in an area with high humidity levels or temperatures of more than 122° Fahrenheit (50° Celsius), the material will degrade. It should be kept away from these conditions to ensure that it lasts for as long as possible.
The chemical structure and functionality of polyols and isocyanates are expected to affect the properties of polyurethanes. However, other materials used in polyurethanes can also influence properties such as density, porosity, morphology, mechanical strength, and rate of reaction.
Here are some of the main ones: Exposure to weathering: Prolonged exposure to the sun's UV radiation, temperature variations, humidity, weathering and other atmospheric agents can affect the durability of polyurethanes.
If you finished your projects at a time when the humidity was very low, the finish may simply not have been cured out well enough. What to do? Make sure you have higher humidity in the air when you finish. Use a “swamp cooler,” add some mist, or do whatever it takes.
The breakdown of polyethylene is promoted and accelerated by environmental elements such as sunlight's UV radiation, oxygen, heat, water, certain animals, and contaminants. The combined action of these factors may have a synergistic effect on the degradation rate of polyethylene [49].
Gloss oil-based varnish, polyurethane and Danish oil can last 10 or 20 years, though satin finishes and stains may fail sooner as pigments and flattening agents disable the driers. Water-based coatings and paints can also be viable longer than three years. Shellac, though, can go bad in under a year.
If it is a polyurethane, i suggest you use a concentrated mineral acid (i'd suggest HCl, as it is the easiest to work with).
In the September issue of Applied and Environmental Microbiology, Jonathan Russell '11 and his colleagues describe how they isolated, from plants collected during the class's two-week spring trips, a fungus they identified as Pestalotiopsis microspora—and then discovered its unique polyurethane-digesting talents.
Vinegar should never be used on polyurethane floors, for example. Because it's an acid, vinegar can eat away at hard finishes like polyurethane and wax. Use only white vinegar, diluted with water, on soft floors that are finished with an oil-based coating.
If your existing urethane finish needs extra protection but not a total refinishing, you can re-coat it with Minwax® Helmsman® Spar Urethane, provided you follow the three rules for re-coating: clean, dry and scuff.
Chemical-based paint strippers, such as those with methylene chloride, are very effective. However, they're also more harsh on your skin and can cause respiratory problems if you're not careful. If you're worried about the effects, you can use water-based strippers instead, though they do take much longer to work.
Rubbing alcohol is generally safe to use on polyurethane surfaces and shouldn't significantly alter the chemical makeup of the material.
To fix this: Allow the finish to dry completely. Lightly sand the cloudy areas with fine-grit sandpaper. Reapply a thin coat of polyurethane, ensuring proper drying conditions.
Under normal use and regular wear and tear, we can expect a lifespan of: 50+ years for building insulation. 25+ years for refrigerators. 20+ years for car bumpers.
Over time, high-traffic areas may show signs of wear and require reapplication of polyurethane. Lightly sand the worn areas with fine-grit sandpaper to create a smooth surface for the new coat to adhere to.
There are four types of degradation that polymers such as polyurethane can undergo in the environment: photodegradation, thermo-oxidative degradation, hydrolytic cleavage and biodegradation (Andrady 2011).
Most polyethylene in open landfills are degraded by photodegradation.
HMC PP resins are appreciably affected by chlorosulfonic acid and oleum at room temperature, 98% sulfuric acid, 30% hydrochloric acid, and 30% hydrogen peroxide at 100°C (212°F). They are also affected by 98% sulfuric acid at 60°C (140°F) and fuming nitric acid and liquid bromine at room temperatures.
To destroy the carbon-carbon single bonds in polyethylene, you would normally need to heat them up at a high temperature under special conditions: without oxygen, or using a catalyst and adding hydrogen.
Use Leather Conditioner
The best option would be "Leather Lotion." It's made specifically for this purpose and also contains waxes that help restore shine while protecting against future damage from UV exposure.
These types of blisters can be caused by coating a damp or wet deck. The most important aspect to all systems is the bond of the coating to the substrate. All precautions should be taken to assure that the deck to receive the Pecora Polyurethane Deck Coating System is thoroughly dry.