Select Neutral Cure 100% RTV Silicone Sealant (Detached Nozzle)

19 reviews Write a Review
Price $7.49


Select Neutral Cure 100% RTV Silicone Sealant (Detached Nozzle)

Some construction and DIY projects - like those that involve adhering materials to surfaces like vinyl windows, doors, and more - require a silicone sealant that is just a little stronger than what’s on most shelves. If you’re looking for the perfect silicone sealant for specialized jobs, look no further than Project 1 Neutral Cure Silicone Sealant. 


This high-quality, professional-grade sealant can be used to adhere to concrete, limestone, brick, mortar, and more surfaces where other products just don’t work. Project 1 Neutral Cure Silicone Sealant adheres  to concrete, limestone, and other surfaces thanks to its strong adhesion. It’s also resistant to both low and high temperatures and UV rays, making it ideal for outdoor use. 


Because it is a neutral curing silicone sealant, Project 1 Neutral Cure Silicone Sealant isn't just effective and easy to apply, but it also has a minimal odor, meaning that the smell won’t be overpowering when this sealant is applied. It’s perfect for indoor use and outdoor use alike and makes for a simple and pleasant application process that differs from many other non-neutral curing silicone sealants out there on the market. Neutral curing silicone sealants like the Project 1 Pro Grade RTV Silicone Sealant are speciality products that can only be purchased from silicone sealant specialists like our team at Silicone Depot. 


Also note that Project 1 Pro Grade RTV Silicone Sealant is your only choice if you’re looking to work on vinyl surfaces, since other types of silicone won’t properly adhere to vinyl windows, doors, and siding. This sealant will form a long-lasting seal on all of these types of surfaces and will not wear down over time, while other types of silicone won’t even adhere. 


If you’re looking for a 100% silicone sealant for use on masonry surfaces that won’t wear them down or corrode them but also won’t wear away in the long term, Silicone Depot’s Project 1 Neutral Cure Silicone Sealant is a great choice. You can use it on any surface from vinyl to concrete, limestone, brick, and mortar. 


  • Sticks to masonry surfaces including concrete, limestone, brick, mortar, and more
  • Also adheres to other surfaces such as gel-coated, sheet metal, and more
  • Strong adhesion for long-lasting applications
  • Resistant to high temperatures and UV rays
  • Can be used for both indoor and outdoor applications
  • Low to no odor 
  • Neutral curing 
  • Same-day rain and weather-ready


  Project 1 Silicone is supplied in a 10.1oz (300ml) caulking cartridge, 5 gallon pails, 
  and 55 gallon drums. Every caulking cartridge comes with one detachable nozzle.

  Warranty and Shelf Life:

  Each application should be pre-tested for suitability of this product for the 
  intended use. When stored in the original, unopened container at temperatures 
  less than 90 degrees F (32 degrees C), our Silicones are guaranteed for one year 
  from date of purchase.


  Important note: Paint will not adhere to silicone sealant but silicone sealant will 
  adhere to most painted surfaces. Always paint first and then seal. Make sure the 
  paint has had time to dry completely before applying silicone sealant.

  Safety Data Sheet

Extra Information


19 Reviews

  • Posted by Marc Garcia on Feb 23rd 2024


    Neutral cure

    The best caulk I have ever used and for a fantastic price!

  • Posted by Small-Town Glass Dave Eggers on Nov 28th 2023


    Project 1 NEUTRAL CURE RTV

    Great product! Only sealant I use for my window and door installation.

  • Posted by Jaime sanchez on Nov 23rd 2023


    RTV silicone

    Very good product, I'm very comfortable to work with it

  • Posted by Mark Cunningham on Jun 30th 2023


    Great Service, Top Quality Silicone

    Good people, good product. What more do you need? Response: Thank you, Mark.

  • Posted by James Weeklund on Apr 6th 2023


    Neutral Cure

    It works well for our company and best price we can get!

  • Posted by Small-Town Glass Dave Eggers on Mar 28th 2023


    Project 1 NEUTRAL CURE RTV

    Great Product and you can't beat the price and availability! I have been ordering this in clear and other colors now for a few years and is always good!

  • Posted by Setzer on Dec 7th 2022


    Great product

    This silicone adheres to anything. We've used it on ICF, concrete, & sheet metal as well as other standard materials. Also had great customer service.

  • Posted by Rudolph J Waros on Sep 28th 2022


    Excellent quality, comparable to all national brands

    Very good price

  • Posted by David Dodd on Jul 29th 2022


    Great adhesion to silicon roof coating

    Great quality for the price. Would have given 5 stars but the color (white) is semi transparent instead of a solid white which made it hard to see while sealing cracks.