+2 Affects solid on -30 STR?

[Sociotard]

I'm building a little canary (STR -30) that has Desolidification (only to protect against fire). Since it can affect the physical world, I need to apply the +2 advantage affects physical world on its str. How do I go about this? Should I treat it like a limitation (-30/(1+2)=-10)? Or would you just forget about it?

[Steve Long]

Personally, I'd probably forget about it. If you need to account for the cost, pretend the STR costs 1 point.