Did original relay boards have plastic melted near traces? Options

[DaveB]

I'm removing the tar off the relay board. I'm finding areas which look like a soldering iron touched and melted the plastic. I don't know if this was used to tack down some of the traces or something else. One area looks like someone laid down a soldering tip.







Was this normal or something else?

Thanks,

DaveB

[Superhawk996]

Normal

It is heat staking used to hold the traces in place during assembly.

Both boards I’ve cleaned had same heat staking in places on the board.

If you look carefully you’ll see they melted top down toward the trace. If the trace had overheated they would be melted at the base where the trace sits.