Welding Tips and Tricks

I need some advice. I frequently weld on SS kitchen equipment, dispensers, baskets, exhaust flumes, and I would rather not grind the inside of the weld and deal with the "sugaring effect". The diversity of the welding makes it impossible to use backing plates and gas purging.

Is there any type of paste or wipe-on wipe-off goo that will control the "sugaring" or block the air in the back of the weld?

Thanks, Richard

Solarflux