do I need a hardner with this?

Can should come with 2.75 oz. plastic tube / part B hardener. Our price is for a case of 12 cans.

can this be used in a reusable caulking gun?

I would say no. This product has to be mixed with a hardening agent that causes it to harden(activate). After activation you probably only have 3-5 minutes before it starts to harden.

Is it really a 12 pack? Or is the picture a misrepresentation?

I don't know about the listing you're viewing but I purchased 1 can at 2 different times.

I believe it dries a greenish blue color.

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🔧 Repair Like a Pro with Dyna-Glass!

VERSATILE USE - Ideal for fiberglass and metal repairs, tackling rust holes effortlessly.
PROFESSIONAL GRADE - Designed for industrial use, ensuring top-tier performance.
UNMATCHED STRENGTH - Engineered with fiberglass for superior durability.
WATERPROOF PROTECTION - Seals and protects against moisture damage.
EFFORTLESS APPLICATION - Smooth, easy-to-spread formula for quick repairs.

The 3M Dynatron Dyna-Glass Short Strand Filler is a professional-grade, fiberglass-reinforced filler designed for strong, waterproof repairs on fiberglass and metal surfaces. Its easy-to-spread formula makes it perfect for tackling rust holes and ensuring long-lasting durability in industrial applications.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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