Heat Solid works wonders when cast on boots. It's even nastier when cast on chainmail.
This reminds me of giving the party a Hotstone; small flat rock allowed
Heat Solid to be cast 1/day. It was mainly for heating tents and meals on cold days. The group tried to use it on spears, arrows, etc. and I told them it was "as
Warm Solid". The spell only affected itself or a solid (single piece), inanimate non-metal material.
But on further research I found the spell is different depending on the List. Fire Law has the non-metal version but Solid Alteration (Mystic) omits "non-metal" from the description. Our Mystic was the one who brought it up.
So now when I give out loot, I'm careful to have the Realm, Spell and
List noted.
These issues might be intentional, but I'm thinking they're unintended typos or omissions that now have tenure.
I don't mind similarly named spells to have slightly different affects from one List to another. It just shows variance in the Professions and who might benefit most from specific magic items.