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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🛠️ Smooth it out like a pro — don’t let cracks steal your spotlight!

EASY APPLICATION - Designed for use with a palette knife, ensuring clean, controlled spreading every time.
GENEROUS 400 G TUBE - Ample filler quantity to tackle multiple repairs without constant repurchasing.
TRUSTED BRAND QUALITY - Manufactured by ICI Paints Akzo Nobel, guaranteeing reliability and superior performance.
PRECISION CRACK REPAIR - Effortlessly fills fine cracks and wood veins up to 2mm wide for flawless surfaces.
PROFESSIONAL GRADE FINISH - Delivers an ultra-smooth, paint-ready surface that elevates your project’s aesthetic.

The POLYCELL Fine Surface Filler Tube (400g) is a premium off-white filler designed for precise repair of fine cracks and wood veins up to 2mm wide. Its ultra-smooth formula ensures a flawless, paint-ready finish, applied easily with a palette knife. Manufactured by ICI Paints Akzo Nobel, this trusted product offers professional-grade quality in a convenient tube, perfect for vehicle body and surface repairs.

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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

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

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