Instructables

plexiglass glue adhesive

I've been hunting for an adhesive or glue to build projects out of plexiglass.  The clear plastic available in many local hardware stores.  Talking to the stores I have been directed to purchase glues that they stock, but these never provide me with the bonding I am looing for.  I suppose what I am looking for is a chemical weld similar to what you get working with pvc and the glues available for those water tight seals.

rickharris4 years ago
Acrylic (plexy glass) is welded with a solvent glue.

In the UK Tensol  www.mcmordiebros.co.uk/tensol_cement.htm is the generally used option but any solvent - Tensol is made of BENZOYL PEROXIDE  but there are a number of solvents that melt plexy glass (acylic.)  Enquire at a local sign maker.

The secret is very flat smooth edges. there must be a good contact or the glue will not get a grip. One version has thickening agents added - normally small amounts of acrylic dissolved in the tensol, this makes the glue a better gap filler but for fine neat work the water thin stuff applied with a brush to the joint is best.

jeff-o4 years ago
I have also used various Weld-On products for various types of plastic.  Check out weld-on's website, they have a guide that helps you select the best type of glue for the plastic you have.
I've seen a two-pack plexiglass glue, used for assembling nuclear glove boxes. I'll try and find the name of it.

Steve
Burf4 years ago
I use Weld-On #3 applied with syringe. Its as thin as water and wicks into the joint for a nearly invisible seam.
Make sure the joints are well fitted and clean and the bond is quite rapid. I usually tape the  pieces together with masking tape before gluing and remove once the glue has completely set.
What you're looking for is a solvent-based glue made especially for plexi. Weld-On #3 is the brand I have used in the past with excellent results. Google "Weld-on Plexiglass glue" for suppliers.
I used it to make a giant fake ice block with a life-sized alien puppet inside it for a show several years ago, and the block held up to the rigors of being schlepped on and off stage, and manhandled by actors for the entire 30-performance run with no cracks or popped welds. Be sure to follow the instructions exactly for the best results.