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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Weldbond 8-50030 Universal Adhesive, 101 fl. oz.

Product ID: 51747220

Details

Brand
Weldbond
Item form
Liquid
Material
PVA
Special feature
Dries Clear
Specific uses for product
Wood

💪Bonds stronger than wood

⏱️Fast setting in 20 minutes

🌧️Water & weather resistant

Description

🔗 Weldbond: The only glue your creative hustle needs!

SPEEDY STRENGTH - Sets in just 20 minutes with no clamping needed—get projects done faster and smarter.
CRAFT LIKE A PRO - No run, no drip formula that sands easily—ideal for carpentry, mosaics, school projects, and beyond.
INVISIBLE FINISH - Dries crystal clear and is paintable—perfect for flawless, professional results every time.
KID SAFE ECO FRIENDLY - Non-toxic, fume-free, and certified environmentally safe—safe for your family and the planet.
ONE GLUE TO RULE THEM ALL - Universal adhesive that bonds ceramics, wood, glass, stone & more—ditch the clutter!

Weldbond8-50030 is a 101 fl. oz. universal PVA adhesive that bonds stronger than wood, sets in 20 minutes without clamping, and dries clear. It’s water-resistant, weatherproof, non-toxic, and eco-certified, making it perfect for carpentry, mosaics, crafts, and family-safe projects.

Specifications

ASIN	B00RM70LKI
Best Sellers Rank	999,431 in DIY & Tools ( See Top 100 in DIY & Tools ) 1,992 in Super Glue
Brand	Weldbond
Colour	Clear
Compatible 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
Container Type	Bottle
Customer Reviews	4.6 4.6 out of 5 stars (450)
Full Cure Time	3E+1 Minutes
Global Trade Identification Number	00058951500308
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
Item Form	Liquid
Item Package Quantity	1
Item Type Name	Glue
Item Volume	101 Fluid Ounces
Item Weight	2.87 Kilograms
Manufacturer	Frank T Ross and Sons
Manufacturer Part Number	3L
Material	PVA
Model Number	8-50030
Number of Packs	1
Number of Pieces	1
Other Special Features of the Product	Dries Clear, Non Toxic, Strong, Washable
Specific Uses For Product	Wood
UPC	058951500308
Unit Count	2986.92 millilitre
Water Resistance Level	Water Resistant

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