Originally Posted by kskwerl
are there any disadvantages to use lead free solder?
Lead-free solder is a headache if you're just going to be using it for DIY related stuff. If you're making something commercially, then you pretty much have to use lead-free solder because of RoHS and all those shenanigans.
In general, lead-free solders have a higher melting temperature, produce less shiny joints, and doesn't 'wet' or 'flow' as well as leaded solders. To put it simply, lead-free is just a pain to work with compared to lead solder. Just stick with a nice eutectic leaded solder for DIY stuff IMO.
That being said, if you have a reaaaally good iron (and I mean it!), and some quality lead-free solder, I think you can get results that are just about as good as leaded solder. I use a JBC soldering iron along with SN100C lead-free solder, and I'm pretty happy with the results, it's a pleasure to work with.
For solder thickness, 0.025inch or 0.7mm will do you just fine for just about anything, don't get anything thicker because it becomes a challenge to control the amount of solder you use. It's all about personal preference though, I tend to prefer the thinner stuff, so I use 0.3mm solder.