Gap filler and/or surface coating for pvc?

[Ray Dunakin]

I'm going to need something to fill gaps on my pvc foam board structure, and I may also want to coat it with something. I think the ideal solution would be something with a paste-like consistency that can be smeared over the surface, and rubbed into gaps, then sanded smooth. But if necessary I could use something like epoxy putty for gap filling, and some other material for coating the surface.

Can anyone here recommend something for either, or both, of these purposes?

[lab-dad]

What about joint compound?
Not sure what your trying to do
Body filler?

[Andi Little]

My product of choice is a "Lightweight" Decorators filler [spackle?]. Comes ready mixed in a tub - relatively cheap, dries far harder than you'd think ................ is water soluble and it is very light.

I'm never sure where everyone's from but if your UK based Wilko's do a home brand product that works very well. If not I'm sure the same product is available locally.

[marc_reusser]

Not quite sure what you are trying to do, but how about artists "modeling paste"...I use one from Liquitex. It can be tinted as desired with acrylic paint...applied as is or thinned with water, dries hard and can be sanded smooth...and will hold a snarp edge. I used to use it over foam-core board to create plaster finishes for arcitectural models. When applied to the board it does cause it to warp to the side that it's applied on, so one will want to apply it to both sides. You can even do multi layer applications, where there is a color/hue variation between the layers, so that when one sands through you get a mottled effect. I have also bent or scored and chipped the surface to get cracks to represent old concrete.

M