is this the best choice for outside mosaic in a temperate climate (40 deg-80 deg F)

I would suggest an adhesive that is not water based as well. Silicone adhesives are waterproof, and would withstand the outdoor use better. Use a grout sealer that is intended to prevent absorption and permanent staining to keep your mosaics looking fantastic.

For sculpture project, will this bond large sheets of cardboard together?

Yes, you can bond large sheets of cardboard together.

Is this food safe? I would like to use it to seal terracotta pots that we will be growing herbs in.

I would say yes.. it is basically a strong water souluable elmers type glue. I would use it on terra cotta pots.

Can i mix this with premixed grout to make it stick better to a wall -a vertical surface? If so, should i mix it or just put a layer on the wall first

You should not mix the glue with grout. If you are putting heavy tile on a wall you would use Thinset which is available in different strengths for walls.

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Description

🧩 Weldbond: The Ultimate Bond for Every Bold Vision

CRAFT LIKE A PRO - No run, no drip formula cleans up with water, ideal for carpentry, mosaics, crafts, and school projects.
INVISIBLE STRENGTH - Dries crystal clear and flexible, ensuring your projects look flawless and last forever.
SPEED MEETS PRECISION - Sets in just 20 minutes with no clamping needed—perfect for busy pros and creative multitaskers.
ONE GLUE TO RULE THEM ALL - Unifies your toolkit by bonding wood, tile, glass, fabric, stone, concrete & more with unmatched strength.
SAFE FOR YOU THE PLANET - Non-toxic, odorless, fume-free, and eco-certified—glue with confidence and conscience.

Weldbond Glue is a 3L (101 oz) professional-grade adhesive that bonds over 100 porous surfaces including wood, tile, glass, fabric, stone, and concrete. It sets quickly in 20 minutes without clamping, dries clear and flexible, and is non-toxic, odorless, and eco-friendly—making it the go-to glue for carpentry, crafts, mosaics, and more.

Specifications

Manufacturer	Frank T Ross and Sons
Part number	3L
Item Weight	2.87 Kilograms
Product Dimensions	24.89 x 15.75 x 13.72 cm; 2.87 kg
Item model number	8-50030
Size	101 Fl. Ounces
Color	Cream
Material	Wood, Glass, Craft, Linoleum, Carpet, Concrete, Cement, Brick Stone, Ceramic, Mosaic, Porcelain, Miniature, Jewelry, Stone, Fabric, Sculpture, Mural, Foam, Styrofoam, Cork, Pottery, Slate, Tile, Clay, Metal, Steel, and More
Item Package Quantity	1
Specification met	Not_applicable
Special Features	Dries Clear, Non Toxic, Strong, Washable, Water Resistant
Specific uses	Wood
Included components	Weldbond Glue 3L / 101 oz - Bonds Most Anything! Non-toxic Adhesive Glue For Wood Glass Tile Craft Fabric Rock Cement & Concrete And Any Other Porous Surfaces. No Fume, & Water Clean Up. Glue Gallon
Batteries Included?	No
Batteries Required?	No

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