What ratio do you use for hardening your sand molds or cores when casting?

Depends on the thickness of your cores. Thick 2.5 to 3.5% More fragile 3.5 to 5.5% Bake at 220 for 10-30 min to cure or Chembond 210 catalyst from clayplanet which also improves moisture resistance. Works great.

does anyone use this for preserving eggs?

Yes, you can use Rutland Products Water Glass to preserve eggs! Call Rutland Products at 1-800-544-1307 for details.

Is this safe to use to seal concrete vessels for candles? Will it emit toxic fumes when heated?

Yes you can use this product near open flame. No toxic fumes will be released.

What is the shelf life after opening the container?

There is no instructions on the container as to how long it lasts once opened. I does dry fairly quickly once applied. That being said it “should” last fairly long if it is kept in an air tight container. I opened my gallon container about 3 months ago and keep the lid closed when not in use, so far no problems.

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The product exactly matches the description. Very satisfied with my purchase.

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Material	glass
Brand	RUTLAND PRODUCTS
Style	Compact
Item Weight	11.45 Pounds
Item dimensions L x W x H	21 x 21 x 19.4 Centimeters
Water Resistance Level	Waterproof
Item Form	Liquid
UPC	022624001461
Net Quantity	1.0 Count
Global Trade Identification Number	00022624001461
Number of Items	1
Colour	White
Surface Recommendation	Floor
Manufacturer	Rutland Products
Country of Origin	USA
Item model number	146
Product Dimensions	20.96 x 20.96 x 19.38 cm; 5.19 kg
ASIN	B004YEDQOK

Rutland Water Glass Cement Floor Sealer & Adhesive, Sodium Silicate 40% Solution, 2000F Heat Rated, 1 Gallon, 128 Oz

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