Imperial QT Texture / A-B Tex Texture Paint / Gun Coat Spray Surfacer / Prep Coat

Imperial QT Texture / A-B Tex Texture Paint / Gun Coat Spray Surfacer / Prep Coat

Manufacturer: United States Gypsum Company (USG) Years Produced: 1955–1976 Asbestos Type: Chrysotile Legal Classification: Tier 2 — Litigated Product

Product Description

United States Gypsum Company (USG), one of the largest gypsum and drywall manufacturers in American industrial history, produced a line of spray-applied texture and surfacing products sold under several product names during the mid-twentieth century. These products — marketed variously as Imperial QT Texture, A-B Tex Texture Paint, Gun Coat Spray Surfacer, and Prep Coat — were designed for application to walls, ceilings, and other interior surfaces in residential, commercial, and industrial construction.

These materials were engineered for spray application and served distinct but related purposes. Imperial QT Texture and A-B Tex Texture Paint were used to create decorative or functional surface coatings with specific visual and acoustic properties. Gun Coat Spray Surfacer and Prep Coat were applied as base or finish layers to gypsum board and plaster surfaces, creating smooth or lightly textured profiles suitable for final finishing.

All four product names appear within the same general product family manufactured by USG during the period spanning 1955 through 1976. During this era, asbestos fibers — specifically chrysotile — were commonly incorporated into spray-applied building materials to improve adhesion, enhance fire resistance, increase tensile strength in the dried film, and reduce cracking and shrinkage. USG’s use of chrysotile in these products was consistent with broader industry practice during the same decades.

Production of these asbestos-containing formulations was discontinued no later than 1976, a period that roughly corresponds with federal regulatory action and growing awareness of the health risks associated with asbestos exposure in building products.

Asbestos Content

The asbestos fiber identified in Imperial QT Texture, A-B Tex Texture Paint, Gun Coat Spray Surfacer, and Prep Coat is chrysotile, the most commercially widespread asbestos variety used in American manufacturing throughout the twentieth century. Chrysotile, sometimes referred to as white asbestos, belongs to the serpentine mineral group and was mined primarily in Canada, the United States, and Russia during the peak years of industrial asbestos use.

In spray-applied texture and surfacing products, chrysotile fibers were incorporated into the dry powder or wet-mix formulation prior to packaging and distribution. The fibers contributed structural reinforcement to the cured coating, helping the material bond to gypsum and plaster substrates while resisting cracking under thermal cycling and structural movement. Fire resistance was an additional benefit valued by manufacturers and builders alike.

Chrysotile, while sometimes characterized as less hazardous than amphibole asbestos varieties such as crocidolite or amosite, is classified by the U.S. Environmental Protection Agency, OSHA, and the International Agency for Research on Cancer (IARC) as a known human carcinogen. All forms of asbestos are regulated under AHERA (Asbestos Hazard Emergency Response Act) and OSHA’s asbestos standards (29 CFR 1910.1001 and 29 CFR 1926.1101), which establish permissible exposure limits and require hazard abatement when asbestos-containing materials are disturbed.

How Workers Were Exposed

The primary exposure pathway for workers using these USG spray texture and surfacing products was inhalation of airborne chrysotile fibers released during product mixing, spray application, sanding, and surface preparation.

Industrial workers generally represent the broad occupational category documented in connection with these products. Within that category, the most likely exposed trades included plasterers, drywall finishers, painters, and general construction laborers who regularly worked with spray-applied surface coatings in commercial and industrial settings. Maintenance personnel who later disturbed or removed these coatings during renovation were also at risk.

The spray application process was particularly hazardous. When dry powder formulations were mixed with water or when pre-mixed materials were loaded into spray guns, fine asbestos-laden dust was released into the work environment. The act of spraying itself generated airborne mist and overspray containing chrysotile fibers. Workers operating spray equipment without adequate respiratory protection received direct, high-concentration exposure. Bystander workers in the same area — electricians, pipefitters, ironworkers, and others performing concurrent trades — were exposed through ambient air contamination.

Sanding and surface preparation after the coating dried created additional exposure events. When dried texture coatings were abraded, sanded, or scraped to achieve a smooth finish, previously bound fibers were re-aerosolized. This secondary exposure could be significant because dried chrysotile-containing coatings, once disturbed, release respirable fibers capable of penetrating deep into the lungs.

Workers in industrial facilities where these products were applied — whether as spray fireproofing analogs or surface preparation materials — faced repeated cumulative exposures over the course of careers spanning years or decades. The latency period for asbestos-related diseases such as mesothelioma, asbestosis, and lung cancer commonly ranges from 20 to 50 years, meaning workers exposed during the 1955–1976 production window may continue to receive diagnoses today.

This article is provided for informational and reference purposes. It is based on documented litigation records, regulatory classification, and publicly available product information. Nothing in this article constitutes legal advice.