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Q: What is the process for surface prep and applying CRS?
A: Typically, pressure wash, degrease and pressure wash again (to remove degreaser). As long as there are no loose debris, CRS will encapsulate and penetrate tightly adhered rust and through to the substrate.
Q: How does CRS eventually attach to the substrate?
A: CRS encapsulates tightly adhered rust to make it into a tough, corrosive-resistant barrier from the environment. CRS then continues to ionically bond to the metal below to create a corrosive resistant barrier to the base metal.
Q: What happens if CRS turns white after it cures or when it comes in contact with water?
A: Because CRS is waterborne, there is a carrier included within the product so that when water or moisture comes in contact with CRS it may turn brown or white. This does not affect the performance of CRS. CRS is not a finish coat it will require a top coat.
Q: What is the speed of application and time-to-recoat?
A: CRS can be applied as a two-coat system depending on the substrate. If the metal and rust is flat and relatively smooth a one-coat system could be sufficient. However if there is a wide range of pit ridges on tightly adhered rust, then a second coat may be required to cover missed spots. The best application method is cross hatching or north-south, east-west. The second coat should be applied when first coat is tacking or near dry. In full sun and wind this could be as quickly as 10-15 minutes, or up to an hour in shaded or humid areas.
Q: Can CRS be applied on wet surfaces?
A: Yes, if the damp surface implies a non-pooling substrate. If there is pooling, waste will occur because it will dilute the waterborne CRS and will adversely affect its anti-corrosion properties.
Q: Does CRS adversely affect any other materials such as plastic, rubber, silicone?
A: Not at all. This is part of our advantage. For example, if coating the chassis of a car, CRS will not harm the rubber or the isolation of any electric wiring.
Q: Is the product recommended to be used before welding or after? Is CRS conductive or not?
A: Both! Standard CRS is conductive. Just coat and weld joints afterwards. However, if you need your surface to be non-conductive, CRS can also be formulated to inhibit conductivity to provide insulating properties as well.
Q: What happens when the coating is breached/damaged and the metal below is exposed?
A: One of the best characteristics of CRS is that it will not allow corrosion transmission beyond the damaged area. Only the exposed/damaged metal will be affected by the environment and can be repaired with CRS as needed. CRS is a fairly durable coating and should withstand normal abrasions.
Q: What is the theoretical estimate on CRS product life expectancy coated surfaces.
A: 10 Years or more.
Q: When can topcoats be applied to CRS?
A: Tacky to dry is the key state to look for when waiting to topcoat. CRS operates under two conditions: 1) because CRS is waterborne, the first state is "water release" which takes some time, and 2) its second state is a chemical cure period which encompasses corrosion and binds ionically to the metal substrate. The chemical cure may occur during or after a topcoat is applied (48 hours) but it is imperative that CRS is dry to the touch before any topcoat is applied.
Q: Any hints or best practices for applying CRS?
A: Always stripe any edge either with a spray brush or roller because CRS is waterborne there will be shrinkage as it cures. We recommend a 25% over-spray with airless or conventional spray equipment. A 519 tip or larger orifice is preferred due to the viscosity of CRS. Spraying too thick of a first coat will delay cure time and decrease the bonding between second coat, paint and/or epoxy topcoat. If rolled or brushed short nap rollers are preferred in a light touch over the substrate or completely covering it with CRS. Well joints and pitted areas should be brushed to insure complete coverage and penetration. Any corroded areas with extensive pitting, jagged edges or uneven substrate should be double coated (two coats via north-south and east-west pattern).
Q: Does CRS actually penetrate paint?
A: Yes. We have extensive test results from Cal Poly San Luis Obispo that confirm (through SEM Testing) interaction between CRS and existing paint and metal substrate, penetration not only occurs but, in some tests, CRS manages to permeate the full thickness of the metal test sheet. Photos and literature are available, contact us for more information.
Q: Why should I use CRS?
A: The highest costs in time and money for any repair/maintenance schedule can usually be found in prep, equipment and labor. The single most obvious advantage for CRS is requiring less costs in each of the above resources. Depending on a contractor’s region, sand blasting, hand tooling/grinding costs that meet or exceed standard preparation requirements (SSPC, ASTM, etc.), will far exceed the price of a CRS treatment and related installation protocol.