Sorry what I meant was, if I push a plastic rawl plug into the Anchorset before it's dried, will the Anchorset go into the rawl plug, thus making it impossible to screw into?
Thanks everyone, I've found this thread really useful — I've created a similar problem for myself when trying to hang a c. 18 KG mirror and now have an oversized hole I need to fill (the wall is red brick with plasterboard in front).
I'm going to try filling the hole with the Anchorset Red 300...