Do transmutation spells stack with polymorph spells?

[FrodoOf9Fingers]

So... the polymorph in the CRB states:

Polymorph wrote:

You can only be affected by one polymorph spell at a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.

However, there are a few "polymorphic" like spells that are not polymorph spells, such as fluid form and enlarge person.

If I was under the effects of "Giant Form", a "transmutation (polymorph)" spell, can I also be under the effects of Enlarge Person, a "transmutation" and Fluid Form, a "transmutation [water]" spell?

RAW, I think they do, but I wanted to get people's opinions before I bring it up to the GM.

[Taenia]

So your cannot stack size increasing abilities onto polymorph

" In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell."

As for other transmutation spells they should work fine, as long as they are not polymorph subschool.