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Click to enlargeLexel FAQ

  1. What is Lexel made of?
    Lexel is a solvent-based co-polymer rubber sealant.


  2. Is Lexel a silicone?
    No. Lexel is the superior alternative to silicone. It is a co-polymer, or synthetic, rubber. Synthetic rubbers like Lexel are more durable, are extremely elastic and have UV inhibitors. Refer to the Lexel page for more information on using it in the same applications as silicone.




  3. Can I paint Lexel?
    Yes, Lexel is paintable within 24-48 hours with latex paints, stains and primers and after 7 days with oil based paints, stains, and primers. (Larger beads of Lexel may require more than 7 days. In addition, cooler and/or humid weather can extend cure time.)


    Latex paints and stains are breathable and some are quite elastic, allowing the Lexel to continue to cure through it while maintaining a flexible film that won't crack. When using a lower quality latex paint or a flat latex paint, it is best to let Lexel cure completely before painting to avoid getting cracks in the paint.


    Some oil based products are not breathable, which prevents proper curing of Lexel. In addition, oil-based products are very rigid when completely dry and can crack over the very elastic Lexel as it goes through its curing. So, wait the full 7 days (longer with larger beads or in cool/humid weather) before painting with oil-based products to avoid getting cracks in the paint.


  4. How should I tool Lexel?
    Use a finger dipped in soapy water or mineral spirits to smooth the bead, or use the back of a spoon with a little dish soap on it and "float" lightly over the top of the bead to smooth it. Keep beads short (no more than 3 feet long) to ensure enough tooling time.


  5. How long will Lexel last? Does it come with a warranty?
    Lexel comes with a limited lifetime warranty. Refer to warranty details on the packaging, brochure or tech data sheet.


  6. Will Lexel stay clear looking? Does it yellow over time?
    Yes. Lexel will always remain ultra-clear without yellowing. Plus, Lexel seals beautifully while resisting mildew and dust collection. Once cured, it can withstand scrubbing with abrasive household cleaners.


  7. What are the benefits of a co-polymer rubber formula like Lexel?
    Depending on the type of polymers used, synthetic rubbers like Lexel are more durable, have high tensile strength and higher UV inhibitors. The solvents in Lexel "clean" the surface for better adhesion and the additives in it soften it and make it more flexible and elastic.


  8. Can I use Lexel in my bathroom?
    Yes. Lexel is ideal for most any bathroom application. Do not use it anywhere it will stay submerged in water (like a bathtub drain). But a shower drain is fine, as long as there will be no standing water on it for long periods of time.


  9. Can I use Lexel in my greenhouse or sauna (areas of high humidity / moisture)?
    Yes. The smell of the solvents during early cure can sometimes be bothersome, so be sure to let it cure before you spend a lot of time in the building if smell is an issue for you.


  10. Can I use Lexel on my camper/RV?
    Lexel is highly recommended for most surfaces on RV's and campers. However, it is risky to use on rubber roof membranes, typically found on RV's. Take care when using it on the rubber roof membranes typically found on RVs and campers. Lexel can cause the rubber to warp some. Cosmetically, it does not look good, but the performance of the Lexel is still good. Some RV's / Campers do have polyethylene and polypropylene, which do not work well with Lexel.


  11. Can I use Lexel on the molding around my wood floors?
    Yes. Clear Lexel can be used anywhere you desire the surface to show through. This is especially helpful when natural woods are caulked, such as around molding or wood floors.


  12. Can I use Lexel to adhere a mirror to the wall?
    No. A mirror adhesive or mirror mastic is recommended. Some silver backings of mirrors can be affected by the solvents in Lexel and can lead to a "ghosting" image in the mirror wherever the Lexel is applied. In addition, the backing materials on mirrors are not always adequate for good adhesion. The backing can pull or tear away from the glass and stick to the wall, while the mirror falls to the ground and shatters. Who needs 7 years of bad luck?


  13. Can I use Lexel to fill cracks in my driveway?
    Polyurethane caulk made for high traffic areas is a better choice. Lexel tends to be too soft for these types of applications.


  14. Can I use Lexel to help with wallpapering?
    Yes. Lexel used over wallpaper edges prevents curling and is an excellent use of its ultra-clear formula.


  15. Can Lexel be used in a non-fish aquarium for animals such as lizards, gerbils, etc.?
    No. Lexel can be toxic to animals of any kind because of the solvents in it.


  16. Can Lexel be used in a swimming pool or hot tub?
    A "marine" type sealant or adhesive such as 3M's 5200 is recommended for those types of applications, as well as poly-sulfide or urethane sealants. Lexel is not a "marine" type sealant and is not recommended to be used in those areas. We have not tested it with pool or hot tub chemicals.


  17. Can Lexel be used in an outdoor fish pond?
    Yes. It must fully cure before putting in fish or other animals. This is okay because there is more "space" and a larger volume of water into which the solvents can dissipate.


  18. Can Lexel be used in food preparation areas or in a refrigerator or freezer?
    It would be ok in the freezer / refrigerator environment (where FDA or USDA approval is not required), as the service range is -30°F to 200°F. However, it should not be used outside of those areas, as Lexel is not FDA or USDA approved.


  19. Can Lexel be used on a kayak? A boat?
    Yes. Below water line at your own risk since we haven't done the testing. We've had some very good feedback from customers on boats and kayaks, both above and below the waterline, with no significant difference between salt water and freshwater submersion.


  20. Can Lexel be used to repair a pond, a fountain, a bird bath, an aquarium, etc?
    Depending on the exact application, it can be used to repair cracks or leaks in all of the above. However, it is toxic until fully cured, so it is not recommended to be used in areas where there is concern for fish, birds, animals or reptiles. Allowing full cure time is best.


  21. Can Lexel be used to seal drums with oil / gas / solvents inside?
    No, not if they have any contact with the Lexel. Oil / gas / solvents will soften and dissolve the polymer in Lexel.


  22. How can I remove Lexel?
    Lexel is not very easy to remove….it is meant to stay. The bead can be softened with mineral spirits or lacquer thinner, then scraped off with a razor blade or putty knife.


  23. Is Lexel electrically conductive?
    Lexel is better characterized as an insulator or dialectric. It does not conduct electricity. However, Sashco does not recommend Lexel being used for direct electrical applications.


  24. Is Lexel fire safe?
    No. It will burn—cured or uncured.


  25. Is Lexel toxic after cure?
    No.


  26. What solvents does Lexel have in it?
    Download the MSDS for more info on the solvents in Lexel.


  27. Will Lexel adhere well to cured concrete that has gotten wet?
    Yes, but there may be some problems. Because concrete is porous, Lexel may have a hard time maintaining adhesion. As the sun comes out and heats up the moisture in the concrete, it will try to escape and may stress the Lexel to the point of failure. Also, many concrete form release agents contain silicones, waxes, etc. that can interfere with the adhesion of Lexel.


  28. Will Lexel help prevent air leaks in my home?
    Yes. Lexel keeps the weather outside. It seals thresholds, sills, siding, vents, pipes and air conditioners. Lexel is also good for leaky air ducts which can heat up your walls instead of your living area. Use Lexel to permanently seal all connections.


  29. Will Lexel prevent radon gas infiltration?
    Lexel can temporarily keep radon gas from getting to the interior of the home; however, eventually the gas can diffuse through any caulk (including Lexel), requiring ventilation. So, it is best to set up a proper ventilation system to direct the gas outdoors.



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