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: 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.

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Manufacturer	Frank T Ross and Sons
Brand	Weldbond
Model Number	8-50030
Product Dimensions	24.89 x 15.75 x 13.72 cm; 2.87 kg
Colour	Clear
Material Type	PVA
Number of Items	1
Size	101 Fl. Ounces
Manufacturer Part Number	3L
Item Weight	2.87 kg

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

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