General FAQ

General

  • The Part A resin has hardened and turned white. Can I still use it?

    Yes. The white solid or haziness is a mass of resin crystals. Crystallized resin will not cure properly. To bring the resin back to a usable state, heat the bottle up in a water bath above 125 degrees F until the resin clears up. It will then be ready for use.

  • Where can I find your Safety Data Sheets (SDS)?

    Up-to-date SDS documents are available on the individual product pages or in the RESOURCES section at SystemThree.com

  • The Part B hardener has gotten darker over time. Can I still use it?

    Probably. Hardeners yellow and darken over time due to contact with air and sunlight. This does not affect their performance. To satisfy yourself do a small test and make sure it cures properly.

  • What is the shelf life of your epoxy resin products?

    We will guarantee the performance of our epoxy products for three years from the date of manufacture, printed on the bottom of the containers, provided they are stored properly. They will probably last much longer, but they should be tested first after the three-year period. The resin may crystallize or the hardener may darken but this does not affect its performance. Crystallized resins should be reheated in a water bath that is 125 F until the resin clears up prior to use in your application.

     

  • Can System Three epoxies be used in direct contact with food?

    Our products are marine or industrial, and not intended for use in applications involving food contact. To claim that a product is food-safe, it must be tested by an independent lab, which we do not do. On the other hand, when some of our two-part epoxy products are properly measured and mixed, then properly cured, they are theoretically inert and would be no more of a problem than many other plastics. But since the accuracy of those processes is beyond our control, we can’t make those claims.

  • Will epoxy resin adhesives bond any material together?

    Epoxy resin adhesives will bond all woods, aluminum and glass well. It does not bond to Teflon, polyethylene, polypropylene, nylon, or Mylar. It bonds poorly to polyvinyl chloride, acrylic and polycarbonate plastics. The only way to tell if an epoxy will bond to a material is to try it. Generally, epoxy adhesives are the best choice for bonding dissimilar materials together. If epoxy bonds to Material A and to Material B it will bond the two materials to each other. The best thing to do is to try it and see for yourself.

Measuring & Mixing

  • Epoxy got hot. What happened?

    Most of our liquid epoxy products need to be poured out soon after the two parts are mixed together to prevent premature curing, called "exotherm."

     

     

Epoxy 101

Safe Handling of Epoxy Resin

Surface Preparation

Preparation

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Product Application

Mirrorcoat™

WR-LPU

  • Custom colors for WR-LPU

    WR-LPU waterborne polyurethane topcoat comes in 12 standard colors.  We will match any color sample you send us for an upcharge with a minimum order of 1 gallon.  Small 4 oz. samples of all 12 colors are available for a nominal charge from the website.  These can be intermixed in any proportions to obtain the color you want in order to have it matched.

  • I want to paint a design on my wood/epoxy paddleboard but I do not know what kind of paint to use or when to paint.

    You can paint your design under or over the epoxy coating.  If it's underneath, ordinary house paint will do.  If it's on top of the resin, we would recommend our WR-LPU.

     

     

     

Miscellaneous

  •  What is the proper surface preparation for gluing wood to metal using G2?

    Make sure that the surfaces are clean, sanded, and free from contaminates.  Best results are achieved by adding some silica thickener to the G2.  Also, apply only enough clamp pressure to close the joint.  Over clamping will squeeze out the G2, resulting in a weak bond. 

  • Can I coat urethane (poly iso) foam with epoxy?

    Silvertip, General Purpose, or Cold Cure epoxy resin will coat the foam without attacking it.

  • How much area can I cover with a bead of adhesive from a cartridge?

    LINEAR FEET OF ADHESIVE OR SEALANT PER CARTRIDGE

            DEPTH      
      INCHES 0.25 0.5 0.75 1 1.25 1.5
      0.25 24.1          
      0.5 12.3 6.0        
    WIDTH 0.75 8.0 4.0 2.7      
      1.0 6.0 3.0 2.0 1.5    
      1.25 4.8 2.4 1.6 1.2 1.0  
      1.5 4.0 2.0 1.3 1.0 0.8 0.7
  • How much working time do I have with my epoxy?

    See Technical Data Sheet or container for working times.

  • Sanding guidelines for applying multiple coats of product.

     

    • Recoating or applying multiple coats of one of our 2:1 epoxy products (General Purpose, SilverTip, Clear Coat, MirrorCoat, etc.) can be done without sanding if done within 72 hours of the previous coat. Beyond 72 hours, sand the previous coat with no higher than 120 grit sand paper to ensure the next coat adheres or properly levels out. 
    • For S-1 Sealer and Cold Cure products, the recoat window is 24 hours. 
    • For all System Three adhesives (Quick Cure, T-88, Gel Magic, MetlWeld, etc.) sand in between coats for best adhesion if a second application is desired. Please follow all instructions on substrate surface preparation prior to applying System Three adhesives.
    • For fairing compounds, putty, and pastes, please allow to fully cure then abrade or sand if additional product is to be applied.

     

  • How long should I wait to sand?

    See Technical Data Sheet or container.

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