Does all of it has to be used at once? Can I use some and store the rest for later use?

Yes can use later. Use seal caps that you originally remove. Activated when mixed together.

Can you use this to replace old crumbling mortar between flagstones over a concrete pad? Not sure if concrete foundation is "water permeable" enough.

It can be used in this situation as long as the concrete foundation is pitched enough to drain water away from the stones after it rains. It is also less of a concern if you live in an area that does not get below freezing. It is also best to clear out as much of the broken mortar as possible.

Is this filler water proof? What bonding material in it?

The Rompox Easy is a Resin based per-mixed product and comes in a vacuum sealed bag inside the bucket. Once the bag is opened the product will start its curing process ,once cured the joints will be water permeable on solid. Romex USA Team

What color is the product used in your ad photos for "sand"?

The Easy color used on the pictures under the sand/neutral color is neutral

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🛡️ Seal your space with the ultimate joint compound—durability meets effortless style!

WEED PEST DEFENSE - Resists weeds and ants naturally, maintaining pristine joints and a flawless finish.
UNMATCHED DURABILITY - Withstands power washing and pedestrian traffic without losing integrity—built to last.
EFFORTLESS DIY MASTERY - Premixed and ready to use—no mixing or compacting needed, saving you time and hassle.
WEATHERPROOF PERFORMANCE - Apply even during drizzle; frost resistant formula ensures no cracking, rain or shine.
ECO CONSCIOUS CRAFTSMANSHIP - Made in Germany with an eco-friendly formula that keeps your outdoor spaces green and clean.

ROMPOX-Easy is a premium, 1-component pre-mixed permeable joint compound designed for both new and existing joints. It offers exceptional durability, high water permeability, and frost resistance, allowing application even during drizzle without cracking. Ideal for DIY enthusiasts and light commercial use, it supports joint widths from 1/4 to 10 cm and depths from 1/2 to 3 cm. Made in Germany with an eco-friendly formula, it resists weeds, ants, and withstands power washing, ensuring long-lasting, maintenance-free paving joints.

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