LOS and FBA, Encasing yourself in opaque materials Options

[Samaels Ghost]

A) One of my PCs asked whether a mage could cast a spell against you (we'll go with Manabolt here since it only affects the living) if your body was encased in opaque materials like when wearing the Full Body Armor.
He brought up the point that you couldnt see through walls while you were astrally perceiving (one of my PCs wanted to do that but we figured the RAW said no) so your aura wouldn't bleed through that armor either, would it? Auras don't 'bleed' through things unless you're forcing your way through, right?

B) Also, would coating your armor with mirror-like rflective material reflect spells back at a mage or other reflected objects?

C) Would readying an action to raise a mirror at the same time as a mage is casting his Manabolt spell at you reflect it away, possibly at the mage if you know where you're pointing the mirror?

Note: I haven't let any of this affect my game yet. No one has gotten away with any of this yet so please no "don't be a pussy GM" or "Just fudge rolls and drop cows on them if they're trying to be clever and inventive" comments. Thank you any help you may give :)