How to correctly say the bold?

She has so much makeup on, I could leave my handprint on her face.

She has so much makeup on [that] I could leave my handprint on her face.

No comma.

Aspara GusShe has so much makeup on [that] I could leave my handprint on her face.No comma.

I agree; my sentence has a comma splice.

canadian45The question is whether "that" is optional.

It is. It’s impractical to view the sentence without that as a run-on, since the use of so as a synonym for very is nonstandard.

Aspara GusIt is. It’s impractical to view the sentence without that as a run-on, since the use of so as a synonym for very is nonstandard.

No, I didn't mean that "so" means 'very'. I think that maybe the answer is that "that" is still implied, even when it's not there.
Anyway, it's late and my brain is sleepy.

canadian45No, I didn't mean that "so" means 'very'.

Then how else did you arrive at the idea that the sentence contained two independent clauses?

canadian45I think that maybe the answer is that "that" is still implied, even when it's not there.

Of course it is, just as it is in any other construction where that is omi

How about these ones?
She has so much makeup on her face as I could leave my handprint on.
She has so much makeup on as in I could leave my handprint on her face.

This?
Could I leave my handprint on her face, she has so much makeup on.

No, no and no.

fivejedjonNo, no and no.

Ok. I'll apreciate wouldn't you mind suggisting corrections, thank you.

screamerer fivejedjonNo, no and no.Ok. I'll apreciate wouldn't you mind suggisting corrections, thank you.

C45 and AG have already discussed this.