what grain of sandpaper should i use to sand down a small filled crack?

A very fine sand paper as the filler is smooth to begin with.

Can you fill holes in polystyrene with this

I have never tried it, but I would imagine that it would fill a hole in expanded polystyrene foam. You can only fill a few millimetres at a time, otherwise it takes ages to dry & harden off, and may also crack if it shrinks. It might be better to use the ordinary Polyfilla for the bulk fill and then use the fine-surface one to finish off. I doubt if either would bond to the polystyrene. The hardened filler is only as strong as the material it is put into, so if the polystyrene flexes it would break away. It is mainly for wood, plaster and so on. Equally I can't think of anything else that might do the job, because the solvents in such materials as two-part polyester fillers could dissolve the foam. Might be worth doing a test patch first, where it doesn't show. Hope that helps.

How long does it take to dry after you apply it?

Depending on the thickness and temperature in the room it will be touch dry after about 30 minutes.. I recommend leaving for 24 hours before sanding back to ensure it has cured fully.

Will this work on uvpc window sill?

Basically, this is a fine grade of plaster filler intended for repairing cracks in plaster . It won't stick to plastic, although it could fill a gap between a plastic window sill and the adjacent plaster, but it isn't a flexible type of product. I would use a silicone sealer for that sort of situation which would flex with the movement of the PVC material.

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Polycell Fine Surface Filler Tube 400g PLCFS400GS, Off White (Packaging may vary)

Product ID: 47892420

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Details

Colour
Off White
Brand
POLYCELL
Item weight
431 Grams
Liquid volume
400
Full cure time
6E+1 Minutes

🎨Ultra-smooth finish for painting

📏Precise 400g tube for controlled application

🛠️Fills cracks up to 2mm

Description

🛠️ Smooth it out, stand out — perfection in every fill!

TRUSTED QUALITY - Manufactured by ICI Paints Akzo Nobel, a leader in premium surface fillers.
EASY APPLICATION - Designed for use with a palette knife, ensuring clean and controlled spreading.
COMPACT CONVENIENT - 400g tube size offers the ideal balance between portability and coverage.
PRECISION CRACK FILLING - Effortlessly fills cracks and wood veins up to 2mm wide with ultra-fine filler.
FLAWLESS SURFACE EVERY TIME - Achieve a crystal-smooth finish perfect for professional painting projects.

Polycell Fine Surface Filler Tube 400g is a premium off-white filler designed to fill cracks and wood veins up to 2mm wide. Its ultra-fine formula ensures a smooth, paint-ready surface, applied easily with a palette knife. Manufactured by ICI Paints Akzo Nobel, this compact tube offers professional-grade results for flawless finishing.

Specifications

Manufacturer	ICI Paints Akzo Nobel
Part Number	6765-1
Product Dimensions	6.5 x 5 x 23.01 cm; 431 g
Item model number	PLCFS400GS
Size	400GM
Colour	Off White
Style	Surface Filler Tub
Material	Glass
Pattern	Single
Power Source	AC
Item Package Quantity	1
Number of Pieces	1
Usage	Fine Surface Filler
Included Components	Polycell Polyfilla Fine Surface Tube 400g
Batteries included?	No
Batteries Required?	No
Item Weight	431 g

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