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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Fine Surface Filler Tube, 400 g, white

Product ID: 47892420

Details

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

⏳30 min initial hardening

🧴400 ml fine surface paste

🛠️2 mm max gap fill

€ 14.43

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Description

🛠️ Fix it fast, fix it flawless — because your space deserves the best.

COMPACT POWER - 400g tube packs enough paste to tackle multiple repairs without bulk or waste.
TRUSTED QUALITY - Backed by ICI Paints Akzo Nobel, a name synonymous with professional-grade materials.
FAST TRACK FIXES - Initial hardening in just 30 minutes means less downtime and quicker project completion.
PRECISION PERFECT - Smooth, fine surface filler ideal for wood and plaster, delivering flawless finishes every time.
TOP RATED RELIABILITY - 4.6-star rating from over 12,000 users proves it’s the go-to choice for DIY pros and managers alike.

Polycell Fine Surface Filler Tube (400g) is a premium plaster-based paste designed for precise repairs on wood and plaster surfaces. It offers a quick initial hardening time of 30 minutes and fills gaps up to 2mm, making it perfect for fine surface finishing. Trusted by thousands with a 4.6-star rating, this product combines professional quality with ease of use for efficient, flawless results.

Specifications

ASIN	B000TAY14C
Best Sellers Rank	160 in DIY & Tools ( See Top 100 in DIY & Tools ) 3 in Hardware Spackling Paste 7 in Expanding Foams
Brand	POLYCELL
Colour	Off White
Customer Reviews	4.5 4.5 out of 5 stars (17,801)
EU Spare Part Availability Duration	1 Years
Full Cure Time	6E+1 Minutes
Global Trade Identification Number	05010567095017, 05010567100407
Included Components	Polycell Polyfilla Fine Surface Tube 400g
Initial Hardening Time	30 Minutes
Item Form	Paste
Item Type Name	Polycell Polyfilla Fine Surface Tube 400g
Item Weight	431 Grams
Liquid Volume	400 Millilitres
Manufacturer	ICI Paints Akzo Nobel
Manufacturer Part Number	6765-1
Material	Plaster
Maximum Gap Fill	2 Millimetres
Model Number	PLCFS400GS
Number of Items	1
Number of Packs	1
Surface Recommendation	Wood, Plaster
Unit Count	1.0 gram
Water Resistance Level	Not Water Resistant

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€ 14.43

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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