How strong is this glue? Can it be used to reapir a crack in 1 galon water reservior?

I would think so, I used it on a conical fermenter for my beer brewing and its worked fine for a few years now. No major pressure on it, just 7 gallons of product.

Can it be applied to a jar to store food in?

I'm not sure, I can tell you its ratted Food Safe. I used it to seal a crack in a conical fermentor I use for home brewed beer and cider. worked fine and left no taste that I could tell.

(white) what is the texture of the surface after cured? smooth? gritty? matte? shiny? how can it be made as smooth as possible?

To make as smooth as possible: after you apply the stuff, spray some water with soap (detergent/shampoo works) and smooth it out with your fingers... this method works great for corners and joints where a bead is required.... will probably make a not so great job on a flat surface :-)

ASIN	B01F9HCISU
Best Sellers Rank	#3,298 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #18 in Silicone Sealers
Item model number	Sil Bond 4500
Manufacturer	Sil-Bond
Product Dimensions	15.24 x 3.81 x 3.81 cm; 0.28 g

Food Grade NSF FDA RTV Silicone Sealant Adhesive White 2.8oz

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