Just how bad is the worst idea ever?

I'm talking about the tinkering encrust that ties three grenades to the weapon with copper wire. Just how bad is this idea? Specifically, what level of resists would allow one to survive, or even ignore, its effect?

I'm having my best run ever right now and I'm not going to experiment (character level 19 on GRPD), but it's staring me in the face every time I open the encrust screen.

 

It's the most Fun you'll ever have.

 

Hehe, thanks. I think I'll have that fun with a different character.

 

I've used it with success once. If you get some of the heavy clockwork armors they give significant amounts of blast resistance as well as standard AA. With enough conflagratory resistance on top of that you can keep pounding things with point blank explosions until your arm gets tired.

Good times.