What is resin glue???

Question

They say it is used for plastic making.....

Answer 1

Not used in 'plastic making', various resin 'glues' (more accurately, adhesives) are used as bonding agents to make a wide variety of products, eg...

Phenolic resins (phenol/formaldehyde) bond thin sheets of wood together to form the laminate known as plywood...or wood chips to make particle board.

Melamine resins (melamine/formaldehyde) bond various cellulosics together to make Formica, Melmac, etc.

In each case the resin (liquid or in soln) is mixed with the other and heated under pressure ('cured 'to a solid) to mold the final product.