Urticating hairs vs new world tarantula

[spodermin]

A spider's own hairs don't affect it at all and I've always gone by the assumption that the same species hairs don't matter either. But what about between two different species? If a brachypelma kicks hairs onto a chromatopelma, for example? Now the second question is: what about 'old world's? Will the hairs have an effect on say, a poecilotheria, or do they not permeate exoskeletons at all? Is it that they just impact us fleshier creatures?

 

[Rs50matt]

as tarantulas can only feel movement through their hairs and lack sensitive skin I’d imagine it will make no difference.