How to Glue Polyethylene Plastic or Polypropylene Plastic

By Samantha Volz
How to Glue, Polyethylene Plastic
Sarah Vantassel/Demand Media

Polyethylene and polypropylene plastics are used in a number of packaging, shipping and production products, including plumbing fittings, bottles and automotive parts. These plastics are designed to take a beating and are generally chemically resistant. According to the Ridout Plastics Company, such chemically resistant materials cannot be glued, since the chemicals in the glue have no effect on the plastics. However, some model suppliers, hardware and home improvement stores or Internet retailers sell liquid plastic adhesive and primer that may be able to bond these plastics.

Step 1

the two surfaces, any bumps, protrusions, the area
Sarah Vantassel/Demand Media

Flatten the two surfaces that will be glued together. Scrape away any bumps or protrusions. Wipe the area clean with a damp washrag. For the adhesive to be effective, the two surfaces must be completely level and clean.

Step 2

a layer, the plastic adhesive primer, each surface, the primer
Sarah Vantassel/Demand Media

Apply a layer of the plastic adhesive primer to each surface. Allow the primer to sit on the surface for 60 seconds so that it becomes stickier as it dries.

Step 3

a layer, the plastic adhesive, each surface, the two surfaces
Sarah Vantassel/Demand Media

Apply a layer of the plastic adhesive to each surface. Immediately press the two surfaces together and hold them tightly for at least 30 seconds. If necessary, use clamps or vices to hold the pieces tightly together.

Step 4

excess glue, the seam, the two surfaces, it
Sarah Vantassel/Demand Media

Scrape away excess glue that seeps out of the seam between the two surfaces. If it is still wet, wipe it away with a rag or towel; if it dries quickly, scrape it away with a utility knife or scraper.

Step 5

the adhesive, any pressure, the glue
Sarah Vantassel/Demand Media

Allow the adhesive to dry overnight before putting any pressure on the joint or expecting the glue to hold effectively.