if you got the full kit, the included caps, (altough unmarked) are in such quantities as to be impossible to mix up - just don’t take them out of the packaging until you are are ready to solder.
I can recommend this one - holds temperature ±5 ° no matter if soldering SMT or good ole Rev 0.5 Digital Board Groundplane - guess you could do Plumbing at your Gutter with it as well…
“Today kids, we will be making the next batch of MIDIpals. Please sign this waver first.” Nevermind those burns Jimmy, thems DIY battle scars. Wear 'em proudly.
Interesting, it almost feels like we have rode this rail before… Cross-contaminating derailmentitus™!
Have you noticed how girls supposedly eating chocolate in adverts never actually consume the stuff - they pull a delighted face when the camera pulls in close, but never swallow, and I’m sure they all spit it out when the camera has finished.