/diy/ - Do It Yourself

>>1202790
>cheap supermarket sponge
Suitable sponges look like pic and expand when wet. Avoid finely pored plastic sponges, they melt.
>40W iron, so it should never get stupidly hot
40W is a lot without regulation. Do you get dark, burned flux resin around the solder joints? If so, try the in-line dimmer mentioned above. More is not always better, ' just enough' is the optimal temperature. You can 'feel' it.