Plaster on plastic

[jtheobald]

I have an internal step which has a plastic threshold. The plaster below this threshold in proud so my friendly Plasterer plastered over the plastic. This lasted about a week before coming away from the plastic. Is it possible to plaster over plastic? I know the edge will be brittle but I'm hoping it may be slightly stronger?

Thanks.

 

[Alastairreid]

Dont really know what you mean! but plaster will never stick to plastic...not for long anyway.

 

[Micilin]

If he has done this, then he is not a plasterer.

You can plaster/render/screed onto plastic if you provide a key. You are not sticking to the plastic, but to whatever is used for a key.

You don't want movement in the background either

You'd be better off with covering it with metal if you want something more hard wearing

 

[plstering]

but why do you want too plaster over it m8 im lost
i gess if you use a knife and a bit of wire mesh screwed to it then a bit of wba/bont it im not puting my name on it m8 sorry
why not use stop bead up to it and skim as you will then hve a straght adge then clean off the upvc with solvent cleaner get it from any window making firm