can I epoxy a plastic cup?

Do you have an old, broken plastic cup that needs to be fixed? Are you wondering if it would be possible to epoxy a plastic cup back together, so it’s like new again?

In this post, we’ll explore the answers to these questions. We’ll explain exactly how epoxy works and whether or not it can be used on plastic items. We’ll also discuss some other options for repairing your favorite mug or cup!

Can you epoxy over plastic cups?

Yes, you can use epoxy resin to glue plastic cups together. However, before you do so, you need to make sure that the plastic cup is made of a material that will bond with the epoxy.

This depends on what type of plastic your cup is made from and how thick it is. If you want to use two-part epoxy for this project, then your best bet is to use polyethylene (such as HDPE or LDPE) because this works well with most types of solvent-based epoxies.

For example: If I have a polyethylene cup and want to glue it together using an epoxy resin like JB Kwik Weld 50/50 or 5 Minute Epoxy Non-Blush Clear Drying Plastic Adhesive Glue Repair Kit then I would probably choose one of those products first because they’re easy to find at most hardware stores or home improvements stores like LoweS.

Does epoxy stick to plastic?

Epoxy is a very versatile product, and it can be applied to many different materials. However, epoxy does not stick to plastic well. In order for epoxy to adhere properly to your cup, you will have to apply a primer first.

Most plastic cups are made from polypropylene or polystyrene (PS), both of which are difficult surfaces for epoxy adhesives to bond with.

If you want your project to work, you will need some sort of protective coating on the first layer before applying your paint sealer or resin overcoat and curing it with UV light or heat lamps.

Some people suggest using masking tape as a way around this issue; however, this technique is not always effective because most plastics contain static electricity that attracts dust particles that can scratch off if rubbed too hard against tape while being peeled off later on during removal process.

Does epoxy resin react with plastic?

Epoxy resin is a thermoset polymer. It can be used to join two items together, but it won’t react chemically with plastic. Epoxy resin will harden when you apply heat, and this process will actually bond the parts together.

If you want to make sure that your epoxy resin bonds well with the plastic cup and lasts for years to come, then you should find out how much pressure is on the cup before making your repair.

Does epoxy melt plastic?

Epoxy resin is not plastic. It is a thermoset polymer, which means it’s hard and not soft like rubber or plastic. If you put epoxy in a cup, it will not melt the cup but rather bond to the outside of it.

Epoxy resin does not melt anything but itself when you apply heat to it at high temperatures.

Can you epoxy plastic Starbucks cups?

You can use a 2-part epoxy resin to make a permanent bond, or you can use a 1-part epoxy to make a temporary bond. You’ll want to put the plastic cup in the freezer for 10 minutes before mixing up your epoxy so it is cool when you stick it together.

You will need:

  • Plastic cup
  • Epoxy Resin (2-Part) (or whatever type of one-part epoxy you would like)

Can you drink from an epoxy resin cup?

The answer to this question is a resounding “no.” You should not drink from an epoxy resin cup, and we’ll tell you why in just a moment.

But first, let’s explain the difference between epoxy resin and plastic—an important distinction that may seem obvious but will help you understand why it’s so important to avoid drinking from these cups in the first place.

Epoxies are hard thermosets with excellent adhesive properties, which makes them ideal for binding together different materials such as glass or metal. Epoxies can also be used to create clear coatings on surfaces like wood or stone because they don’t yellow over time like lacquers do.

Plastics, on the other hand (and no pun intended), are made up of long chains called polymers that contain many small molecules that bond together under heat or pressure into one large molecule called polymers!

These plastics are usually made from petroleum products such as oil or gas that are heated until they combine with air molecules resulting in carbon dioxide emissions being released into our atmosphere contributing towards global warming!

What kind of epoxy is used for plastic?

Epoxy is a resin and hardener. It’s used to create strong bonds between two or more materials, such as plastic and metal. Epoxy can be found in hardware stores as well as online stores like Amazon.

Plastic is also a material that comes in many different forms; it’s not just for drinking cups! You can find plastics made from all kinds of polymers (plastics), including polyethylene, polystyrene and polypropylene.

Polyethylene is a polymer that has been around since the 1930s when it was first created by accident during the process of developing synthetic rubbers during WW2 efforts to make artificial rubber from coal tar products available domestically rather than having to import them from Japan where they were being produced at the time (this stopped production).

How do you apply epoxy to plastic?

  • Clean your plastic. Make sure you use acetone to clean off any oils or contaminants from the plastic. You can also use rubbing alcohol, but it might leave a residue so make sure you rinse it off really well with water.
  • Apply epoxy to the plastic. Now that your project piece is clean and dry, mix up some epoxy according to the directions on the package and apply it directly onto the surface where you want it to be permanently attached (or at least until you are ready for another coat). Don’t worry about getting any on yourself because most of these glues are water-soluble and will wash right off with soap and water! Just make sure not to breathe in a lot of fumes when working with this stuff since they may irritate allergies or asthma-like symptoms in some people who have them already (see warning label).
  • Wait for everything dry before handling again by putting some newspaper underneath so no dust gets attracted onto anything else around there as well! It’s also important not to touch anything until full curing time has passed because touching something wet could cause fingerprints which aren’t very attractive depending on how long they last.


In the end, we hope this article has helped you answer your question about epoxy and plastic. We know it can be confusing and overwhelming when trying to decide what kind of adhesive will work best for your project.

But no matter what type of material you’re working with, there’s always going to be an appropriate option available!

Photo of author

Martin Flood

Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.

Leave a Comment