Mastic adhesive, also known as construction adhesive, is a heavy-duty bonding agent that is extremely thick. It has numerous construction applications in mastic for flooring, roofing, molding, dry walling, paneling, and is used with many materials including wood, metal, masonry, and concrete. Because mastic adhesive is quite flexible and waterproof, it is a popular bonding agent for outside use, reducing the need for nails and screws. Although it is a high-grade adhesive used every day by trained professionals, do-it-yourself enthusiasts can also use it, following some simple directions.
Step 1 - Prep the Area
Make sure to thoroughly clean whatever surface areas you wish to bond together. Make sure wood areas are free from all wax, varnish, and paint. Make sure that cement areas and all other types are totally free from dirt and grease or loose material.
Step 2 - Apply
There are a number of different methods to transfer adhesive to the surface area to be bonded depending on size and amount of adhesive that needs to be used. Mastic adhesive can come in tubes, cans, or larger containers. It can be applied directly from a tube working on small surface areas or transferred on a stick or trowel to large surface areas before being spread. Apply as much product as necessary to ensure a lasting bond.
Step 3 - Clamp It
Secure the bonded surfaces by clamping them together. Or, if clamping is not appropriate, place heavy items on top of an object bonding to the one connected below. Be careful that no excessive mastic adhesive squeezes out.
Step 4 - Dry Time
Allow the objects being bound by mastic adhesive 24 hours to cure. The mixture should set in about 10 minutes after application so make necessary adjustments quickly.
Step 5 - Clean Up
Make sure to thoroughly clean up the entire area using mineral spirits or turpentine to remove leftover, stray or excessive mastic adhesive. Always read the manufacturer’s directions before using cleaning products.
Step 6 - Remove Bonding Help
After allowing a 24-hour drying period, remove all weights or clamps used. All bonding areas are ready for use.
Note: As with any type of construction chores, certain precautions are needed to ensure safe operation. Always wear protective gloves when using adhesives because stray material will start setting in 10 minutes, requiring special attention to remove any excess that begins to harden on unprotected skin. Also, pay special attention to ventilation. It is extremely important to have adequate air circulation in your work area. Using a ventilator mask is always a wise choice. Some adhesives contain harmful toxins if breathed requiring more extensive fume filtering respiratory masks.