I've soldered one, and it works just fine. Not hard, but I'd offer a couple of thoughts.
You obviously need to get any gasoline out of the bulb before you solder. Not always easy. I cleaned up the whole outside of the bulb first (nothing more than a soft toothbrush dipped in a little plumber's flux and just enough heat to liquify the flux -- you don't want to be pokin' any more holes!). Then I used a 1/16" drill bit (smallest one I had) to make a small vent hole on the corner of the bulb as close to opposite the leak that I had as I could (drains more completely that way). Didn't drill it out to the whole 1/16, just enough to puncture a pinhole. The aim was to make a vent so it would drain better, and having the vent helped to show up where the leak was that let the gas in in the firt place. It was also small enough to solder back over easily.
The other is to have your your surface clean and prepped and your iron good and hot so you can work quickly. a) It couldn't hurt to clean and flux up all around the seam as well as the holes you know of before you start in case you get into trouble under "b". b) If you have to leave the iron on the bulb too long, you run the chance of getting the area surrounding your leaks too hot, and opening up a new leak in the solder that holds the two halves together. Alittle brake or carb cleaner to remove the excess flux and back in she goes.
I may be overcautious. I don't think the bulb would get hot enough during soldering to ignite the gas fumes left inside the bulb. All the same, once I got the gas out of mine, I submerged it in water and let it fill back up to purge the gasoline fumes, then redrained it (did that twice). To get any residual water out of it, I left it propped up with my vent hole at the bottom to rest overnight. Next day I heated it lightly with a torch but enough to evaporate any water inside. Did that twice, too, letting it cool in between, before doing the soldering.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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