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RectorSeal Sprayable Metacaulk 835+ Elastomeric FirestopAdhesives, Sealants & Coatings

RectorSeal Sprayable Metacaulk 835+ Elastomeric Firestop

RectorSeal, Houston, a leading manufacturer of quality firestop construction products, has added a sprayable, silicone-based curtain wall joint sealant to its renowned Metacaulk 835+ elastomeric firestop sealant product line.

The Metacaulk 835+ Spray is one of the construction industry’s most quick-curing and resilient silicone-based firestop sealants with elastomeric characteristics that aren’t compromised by seismic movement, rainfall, weather and other jobsite conditions.

The easy-applying Metacaulk 835+ Spray is the perfect balance between spray-ability, pot life and flow-able viscosity. It outperforms the competition with its non-sag characteristics, resiliency, 30 to 60-minute tack time and quick 24-hour cure time (depending on ambient temperature).

It’s manufactured in a concrete-matching gray color and is available in an easy-handling five-gallon (19-L) pail.

Metacaulk 835+ Spray carries a Class I W-rating and is tested in accordance with ASTM E1966 (UL 2079), ASTM E2307, ASTM E90 and ASTM E1399. It meets Type S, Grade P, Class 25, Use NT, M, G, A, O. Metacaulk 835+ Spray can be applied on any interior/exterior curtain wall joint. A full list of approved systems are listed at

After the curtain wall joint is prepared and filled with mineral wool, the sealant is applied with an airless sprayer and features a non-slumping formation with a delayed reactivity onset for improved workability. Applications don’t require priming on most building materials. Metacaulk 835+ Spray is tested and proven to seal joints from fire and smoke.

The new spray complements the existing product line of Metacaulk 835+ elastomeric joint sealants that are available in a five-gallon pail (19-L) or 10.15-ounce (300-mL) caulk cartridge or 20.2-ounce (597-mL) self-leveling or caulk grade sausage packs.

Other benefits of the Metacaulk 835+ Spray include:

  • Future product developments will go beyond curtain wall and include other joint applications;
  • Recommended spray equipment, tips, cleaning and instructions are available on the RectorSeal website;
  • Shelf life is 18 months when stored in a clean, dry, temperature-controlled area;
  • Designed to last the sustainable lifecycle of the building when applied per manufacturer's requirements;

Metacaulk 835+ Spray is part of RectorSeal’s Metacaulk product line consisting of firestop smoke sealants, caulks, sprays, putties, electrical outlets, membrane penetration protection devices, joint and wrap strips and other fine firestop products. Metacaulk is available from authorized Rectorseal wholesale distributors for the plumbing, HVAC, electrical and building construction trades.

For additional information on products from RectorSeal's construction division, visit or, email:; or call 800-231-3345.