Our goal is to give those interested in learning the fundamentals of the chemistry the knowledge to empower themselves to mak… This will be especially true if applying in hot, dry or windy conditions. You can apply polyurethane over any paint, as long as the surface is clean and prepared well to receive the polyurethane coat. One great benefit is that these epoxies are usually low VOC and have little to no odor. They are available in water and solvent based versions and a range of sheen levels. In fact, the lifespan of the PU system is roughly double that of the epoxy, clocking an impressive ten-year’s compared to the epoxy’s five. Here’s some of the different types of Polyurethane Coatings: – Moisture Cured Urethanes: Moisture Cured Urethanes are one component urethanes that cure off of moisture and humidity. These epoxies can generally be used on steel, concrete, and galvanized steel. It is ideal as an anti-graffiti coating and has outstanding chemical and abrasion resistance. (. Recommended as finish coat for concrete floors in high traffic areas and exterior structural steel surfaces. This all depends on the floor application and what the desired end result. Applying one or two coats of polyurethane over paint would be a great move more than that would be futile. Epoxies do not have a long working time because once mixed the epoxy reacts with the hardener so it is important to remember that time is of the essence. ". Epoxy Coatings: The Pros An epoxy floor coating is a two-part system that results in an extremely hard and durable surface. They are also UV stable meaning when sunlight is exposed on it they will not yellow over time like some epoxies. It will dry thick provide an abrasion resistant surface. Water and chemical resistance: Resistance to water, steam, moisture, and most chemicals means that PU coating is a waterproof barrier, preventing corrosion of the substrate. March 27, 2018 One concern with polyurethanes is their sensitivity to humidity and moisture. ... Polyurethane Paint Coatings. This means that it won’t yellow like epoxy does when exposed to small amounts of sunlight over a period of time. Polyurethane originally was an oil-based varnish with more plasticity than older varnishes or paints. For over 40 years, Gulf Coast Paint has been helping owners and contractors determine the best coating solution for their specific need. Once dry its completely waterproof and will not leave marks on furniture from a glass. Aliphatic polyurethane's are extremely flexible and allow for good impact resistant. Here’s some of the different types of Polyurethane Coatings: Moisture Cured Urethanes are one component urethanes that cure off of moisture and humidity. stable. @siwarak If you are referring to Polyurethane as “PU” these layers can be built on top of one another. Thank you. Quick drying and easy to apply: Polyurethane paint is fast curing, meaning less downtime and associated losses.Like an epoxy it is easy to apply, but polyurethane has faster return-to-service times than epoxy. Hello, A polymer is a macromolecule that contains a large number of small repeating units . If an uncured PU floor is attacked by water or condensation you may get this catastrophic results (like in the picture below). One of downsides of epoxies is that will eventually chalk and fade. These coatings are usually sold as finish and are usually applied at 2-3 mils DFT. Polyurethane paints also tend to become tacky very quickly due to solvent leaving the paint surface. The most common type is aliphatic polyurethanes as they are anywhere from 55-75% solids and dry 1-4 mils thick depending on application process. These coatings are used for exterior steel surfaces for long term protection. Here are some different types of epoxies and urethanes that can be used in your facility: Epoxy Coatings:  Epoxies have excellent adhesion to many substrates. However, in general, epoxy paint is not used on wood but rather on metals. They can be used as a primer, intermediate and topcoat depending on application. Website by Dreamedia. (MCU-100, MCU-101, MCU-104), – Acrylic Polyurethanes: Acrylic Polyurethanes are known for their excellent gloss and color retention, UV resistance, and provides a tough and durable finish. Whilst a polyurethane system will initially cost more compared to an epoxy, it is far more cost effective in the long term. Polyurethane Coatings. Here’s Some Questions a Representative Should Ask. This chemical protects against damage, UV rays, and water. (. What is the differance between Epoxy paint and Enamel paint? What are the Best Industrial Coatings for Structural Steel? Most H.S. Most high solids epoxies provide excellent protection against acids and alkalis. They usually do not hold up as well against chemicals and some of the solvent based & 100% solids epoxies. Epoxy resins may be reacted (cross-linked) either with themselves through catalytic homopolymerisation, or with a wide range of co-reactants including polyfunctional amines, acids (and acid anhydrides), phenols, alcohols and thiols. PU systems also benefit from their increased wear, abrasion and impact resistance properties. 2. One of the most popular high solids epoxies is Amine Adduct Epoxies. As paint. I use polyurethanes for hardwood flooring. As long as the surface is well prepped you can add as many layers as you would like but be careful to ensure you are using non skid in your final coating (depending on the type of nonskid) to ensure your final floor surface is slip resistant. With so many different options available, it can be difficult to decide what is best for your facility. EPOXY RESIN - LPU - MCU - POLYURETHANE . (CM-15, PC-155, PC-275, PC-650), – Polyamide Epoxies: Polyamide Epoxies are one of the older epoxy technologies that are still used today. Most H.S. Epoxy resins are also sensitive to moisture, but the damage done by humidity will be far more limited. Operational Differences 10. Is this possible? They have a short pot life – generally 20-40 minutes and they usually can’t be recoated until 6+ hours. Usually these epoxies are economical and are used a primer and finish coat. They generally have very good chemical resistance which allows the higher performing epoxies to be used for tank linings, containment areas, and for general protection against chemicals. They generally have very good chemical resistance which allows the higher performing epoxies to be used for tank linings, containment areas, and for general protection against chemicals. Our paint vender is telling us that even though the paint can states Enamel, that after we add the hardener, it becomes Epoxy. They provide a hard, high gloss tile-like finish that has outstanding wash and scrubbability. These epoxies are designed by having the curing agent with a small amount of epoxy resin. Polyurethanes are known for their outstanding UV resistance, gloss retention and color stability. They have a long pot life, great adhesion, and good chemical resistance. Epoxy paint is very slick. They can be mixed with different aggregates for trowel downs to resurface concrete. As a coating or sealant. The benefit to using polyurethanes is that they bond well to one another. The right choice could mean added useful life and less maintenance for key assets. With both epoxy and polyurethane floor coating offering a number of benefits, you may be able to combine them to get the best of both worlds. In the application point of view, the main difference between epoxy and polyurethane is that the epoxy resins can resist moderate temperatures while the polyurethanes can withstand high temperatures. 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