Use Weld-On (water consistency) acrylic cement for joining acrylic plastics, particularly when laminating multiple colored plastics together. Sold in a 4oz. can. The 2oz. applicator bottle with 20 ga. (syringe type)
needle is sold separately.

If it’s clear acrylic then you want to use the Weld-On #16 gel. It dries optically clear so you can’t even see the glue joint. Sold in a 5oz. tube and the consistency is like syrup. It will dry clear so it will not show the glue joint.

If you are bonding ABS plastic to itself or bonding other styrene and polycarbonate type plastics to themselves, use Weld-On #2354. It’s got the consistency of syrup and is sold in a 5oz. can. This adhesive is not for joining dissimilar plastics.