3M 78 Polystyrene Foam Insulation Spray Adhesive - Industrial Bonding

In this review of the 3M 78 Polystyrene Foam Insulation Spray Adhesive, the bottom line is simple: this aerosol is built for professionals who need an industrial-strength adhesive that bonds expanded polystyrene (EPS) without dissolving it. The reviewer found it most valuable on insulation projects and polystyrene block assembly where a reliable, long-lasting hold matters. With a lace spray pattern for even coverage and up to 15 minutes of working time, this product is for tradespeople and contractors who require predictable positioning and durable adhesion in demanding environments.

Key Features

• Industrial grade bonding: Formulated to provide strong, professional-strength bonds suitable for demanding insulation and construction tasks.
• Polystyrene safe: Specifically designed for expanded polystyrene foam, it does not dissolve or degrade EPS when used as instructed.
• Lace spray pattern: Applies in a lace pattern that delivers even coverage to reduce waste and improve bond consistency across foam panels.
• Working time: Offers up to 15 minutes of repositioning time to align insulation panels before the bond sets.
• Versatile adhesion: Bonds insulation to a variety of substrates including wood, metal, plastics, and paper for common site applications.
• Compatible system use: Can be used with the 3M Cylinder Spray Adhesive System for larger or repeated jobs to improve handling and application speed.

Who It's For

The 3M 78 spray adhesive is aimed at industrial and trade professionals installing foundation insulation, assembling polystyrene blocks, or attaching EPS to wood and other substrates. Contractors who need a stable working time and a product that will not compromise foam integrity will appreciate the formulation.

It is not intended for consumer retail sale or casual do-it-yourselfers; the product contains 1,1-difluoroethane and is labeled for industrial/occupational use only, and it is not sold in certain jurisdictions. Those seeking a consumer-grade adhesive or a product cleared for general household use should look for consumer-labelled alternatives.

Pros & Cons

Pros

• Provides strong adhesion to EPS and many common substrates without melting the foam.
• Lace spray pattern promotes even coverage and efficient use of material.
• Up to 15 minutes of working time allows adjustment and repositioning during installation.
• Designed for industrial applications, offering a professional-level solution for demanding jobs.

Cons

• Restricted to industrial and occupational use, so it is not appropriate for consumer purchases or casual projects.
• Some users reported mixed impressions of spray effectiveness, which can depend on technique and equipment used.

Specifications

Brand	3M
Product Type	Polystyrene foam insulation spray adhesive
Container	17.9 oz aerosol can
Working Time	Up to 15 minutes
Safe for	Expanded polystyrene foam (EPS)
Solvent Note	Contains 1,1-difluoroethane
Application Pattern	Lace spray pattern for even coverage

Our Verdict

The 3M 78 Spray Adhesive is a solid choice for professionals who need a reliable, non-damaging adhesive for EPS and insulation work; it delivers industrial-strength bonds and gives installers time to position materials. Given its limitations for consumer sale and the need for proper handling, it represents good value for contractors and trade users who require consistent performance on insulation projects.

Frequently Asked Questions

Is this safe for expanded polystyrene foam?
Yes, when used according to 3M instructions the formulation avoids dissolving or degrading EPS.

How long can you reposition after spraying?
The product provides up to 15 minutes of working time for adjustment and repositioning before the bond sets.

Can this be used on other materials besides foam?
Yes, it bonds insulation to substrates such as wood, metal, plastics, and paper, making it suitable for common site applications.