Re: Soldering brass pex fittings
JB, it sounds to me like you're doing just fine. The brass fitting has a larger thermal mass, plus slightly lower thermal conductivity* than copper, so it takes a little longer to cool down to the point where the solder solidifies. Once you've applied the solder, let it cool sufficiently before moving the joint. If the visible solder is mirror-shiny, it's still molten. When it turns slightly dull, it's solid. If you move the joint while the solder is still molten you can cause an incomplete seal (and therefore, leaks).
When you are soldering onto valve bodies (shower, faucet, etc.) be sure to remove the cartridge/washers so you don't melt the plastic or rubber.
*I think. I could be wrong.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.