Mock up glue

[Jabba]

Hello all,
I would like your words of wisdom on something.
I need to know if theres a glue I can use for mocking-up i.e. test building subassemblies or panels etc before painting to make sure of a correct fit , or , when scratch building, trying out the fit of an engine/transmission/suspension in a pretty solid way, but then being able to un-glue everything for painting?
I often see on-line, especially from USA model builders, custom cars built completely 'in white' to make sure everything fits. You can't tell me they paint them built-up like that so they must use some glue which can hold it all in the correct position but can be dissolved after.
The ones I have asked about it have said they use 'white glue' which I'm thinking means PVA?
What are your thoughts?
Yours
Peter

[Geoffers]

Yep, PVA glue seems to make sense.

Not sure how they go about it as I really struggle with PVA as it seems to take forever to set.

I sometimes use a tiny and I mean tiny bit of CA glue to hold pieces in place when I’m test fitting. The parts then come apart with a little bit of pressure.
I clean up with a wipe of de-bonder if necessary.

Geoff.

[Tim Marlow]

Probably studio gum (it replaced the latex cow gum) I think. I used to use it to stick the little blokes to painting sticks before I discovered blue tac. When dry it just rubs off the surface. Could also be copydex, which is very similar.

[Jim R]

Could you use a few dots of masking fluid???