What glues did Hasbro use?

[mazinfriki]

I know epoxy glue is the best, but what did Hasbro/Palitoy/geyper etc use for the heads?

They look like a very thin glues, some of them can be scraped easily, some are harder to remove, but not as hard as epoxy. Do you know what was it?

[Ray (Flock Man)]

In some circles we’ve talked about this many times. Someone showed me an old purchase order that said, “polyurethane- adhesive”, but I tend to believe it was a thin automotive solvent based epoxy along the lines of what they use for dashboards and glove boxes. I also believe they used an etch solution (hence the textured glue stain). I think the original product used was much stronger because some heads are really tough to clean off. Other heads strip off very easy. I say the thin epoxy because I’ve used this un-modified at one point and it acted the exact same way as the original glue. In the end it comes down to a prep thing. The prep of the head is the biggest part of the glue up.

[mazinfriki]

Residues on the easier heads to peel off is very thin and it penetrates well. I'd bet it is a solvent-based glue...