Nano-velcro binds faster than strongest glues

I don't think this needs an image but my prints won't stick together with gorilla glue, do I need to do something to them to get them to stick (using PETG)

Micromachines, Free Full-Text

What glue should I use to fill in and reattached a shoe sole? - Quora

News Nature

News - latest articles - page 839

The 10 Strongest Glues

News Nature

Nano-velcro binds faster than strongest glues

Soft underwater adhesives based on weak molecular interactions - ScienceDirect

Der stärkste Klebstoff der Welt

【MULTIFUNCTIONAL 】- This transparent tape will stick to almost anything with a smooth surface. Such as a led strip on the wall, floor strips, acrylic

Double Sided Tape Heavy Duty, 180 PCS Strong Adhesive Mounting Tape Traceless Transparent Tape Removable Strips Sticky Nano Tape for Paste