is this idea to filled large molded circles on models, then sanding it down?

No, that will probably peel out. I use it mostly for pinholes and tiny divots, for that is it is fantastic. Make sure you let it set up overnight at least. The longer it sits, the harder it gets. For large areas, though, I use Magic Sculpt.

Is this sandable after it drys?

I don't use this for filling surfaces I intend to sand. It might work for a small seam after a really good drying, but I would use Mr. Surfacer for projects that still need sanding.

Would this allow me to afix and glue a plastic face mask into the hole of a flat plastic sheet to mount into a shadow box??

It says plastic putty and more likely this would be seal gaps in a plastic model,I my myself would try contact cement/glue

I have a small crack in one of my white floor tiles. Will the Plastic Putty work for filling it in?

I don't think it's the right putty for that. This is a hobby putty

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Plastic Putty 18 ml (0.6 fl.oz.) | White, Opaque, Consistent Finish

Plastic Putty 18 ml (0.6 fl.oz.) | White, Opaque, Consistent Finish

Product ID: 9843662

Details

Age Range (Description)
168 months to
Brand
Vallejo
Color
White
Included Components
Plastic Putty
Item Weight
0.08 Pounds
Item dimensions L x W x H
3.13 x 1 x 1

🎨Opaque white acrylic finish

⚙️18 ml precision volume

🛠️Hard, sandable & paintable surface

€ 21.00

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Sold byAmazon FinlandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎯 Nail every detail with Vallejo’s Plastic Putty — where precision meets perfection!

COMPACT CONVENIENT - 18 ml size fits perfectly in your toolkit for on-the-go modeling mastery.
WATER SOLUBLE FORMULA - Clean up with ease—no harsh chemicals required, ideal for eco-conscious creators.
FLAWLESS MODEL RESTRUCTURING - Achieve smooth, consistent fills with marble powder-enhanced acrylic putty.
EFFORTLESS SANDING PAINTING - Easily shape and decorate your projects for a professional finish every time.
VERSATILE SURFACE COMPATIBILITY - Perfect adhesion on both plastic and wood for diverse creative needs.

Vallejo Plastic Putty is an 18 ml white acrylic paste infused with marble powder, designed to dry into a hard, fully opaque surface. Ideal for model making, repairs, and surface decoration, it sands smoothly and accepts paint effortlessly. Suitable for plastic and wood, this water-soluble putty offers professional-grade finish in a compact size favored by hobbyists and pros alike.

Specifications

ASIN	B000PHCNLC
Age Range Description	168 months to 1200 months
Brand Name	Vallejo
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (8,674)
Global Trade Identification Number	08429551704007
Included Components	Plastic Putty 18 ml (0.61 fl.oz.)
Item Dimensions	3.13 x 1 x 1 inches
Item Type Name	PLASTIC PUTTY 17ML
Item Weight	0.08 Pounds
Manufacturer	MMD Holdings, LLC
Manufacturer Part Number	VJ70400
Material Type	Acrylic
Model Name	Vallejo
Model Number	VJ70400
Number of Items	1
Recommended Uses For Product	Modeling
Unit Count	1.0 Count
Warranty Description	No Warranty

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