does bondo come with the hardner

Yes, it comes with the hardener. You will find it when you take off the clear/white plastic lid.

Do I have to use fiberglass patch before applying the Bondo body filler? Or I can use it without the fiberglass patch on the car

Whether or not you use a fiberglass screen/cloth embedded in the Bondo depends on the job you are doing. I've seen people use this stuff a half inch thick or more without any fiber glass reinforcement. I'd definitely forgo the fiberglass with 1/4" or less. If the dent is on an old car fender that will flex some when you hit pot holes, and the dent is more than about 1/8" then fiberglass may help avoid cracking of the Bondo. Most important is drilling a grid of holes about 1/8" diameter and spaced about 3/4" apart over the area to be filled. You will push some Bondo through those holes to help lock the Bondo onto the metal. Of course surface preparation is also important to adhesion. Follow instructions carefully for that. If you do use fiberglass, be sure there is a layer of Bondo under it as well as on top of each layer of glass and work the Bondo into it well. I.e., the glass needs to be fully embedded in Bondo. Bondo does not work on things like a plastic bumper that naturally flexes (Bondo does not flex much). There are special products and procedures for repairing plastic front/rear covers.

Is this stuff water proof?

Yes it is. We used it to seal the new cabinet on our hot tub. It was recommended by the company who services the tub. No problems. Hope this helps.

Can you add color to this before you use it ?

Use a colored hardner close to the color you want or do the red/blue=purple.

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Bondo Body Repair Kit, Original Formula for Fast, Easy Repair & Restoration of Your Vehicle, 00310, Filler 14 oz and Hardener: 0.5 oz, 1 Kit

Bondo Body Repair Kit, Original Formula for Fast, Easy Repair & Restoration of Your Vehicle, 00310, Filler 14 oz and Hardener: 0.5 oz, 1 Kit

Product ID: 19719145

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Details

Brand
Bondo
Specific Uses For Product
Repair
Material
(Metal and
Compatible Material
Metal
Item Form
Cream

🎨Sands smooth, paint-ready finish

⏱️Ready-mix pouches, 3-min work time

🛠️All-in-one kit for holes ≤3"

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Description

🛠️ Fix it like a pro, before your ride’s story fades!

FLAWLESS FINISH FAST - Sands easily to a smooth, paint-ready surface so your repair blends invisibly and looks showroom fresh.
COMPLETE REPAIR ARSENAL - Everything you need to fix rust holes and dents up to 3 inches—no extra purchases required.
PRO GRADE BONDING POWER - Two-part fillers chemically fuse to metal and fiberglass for a durable, non-shrinking repair that lasts.
EFFORTLESS PRECISION MIXING - Pre-measured pouches with color-change hardener indicator eliminate guesswork and speed up your workflow.
VERSATILITY MEETS DURABILITY - Perfect for automotive and marine surfaces—metal, fiberglass, and more—delivering professional results every time.

The Bondo Auto Body Repair Kit is a professional-grade, all-in-one solution designed to repair rust holes and dents up to 3 inches on vehicles and boats. Featuring original and fiberglass fillers with hardeners, a self-adhesive patch, and a spreader, it offers a durable, chemically bonded, non-shrinking repair. Ready-mix pouches with color-change indicators ensure quick, precise application, while the formula sands smoothly for a paint-ready, seamless finish—perfect for millennial managers who demand efficiency and flawless results.

Specifications

Brand	Bondo
Specific Uses For Product	hot-rod-vehicles
Material	Metal and Plastic
Item Form	Cream
Color	Salmon
Item Package Quantity	1
Manufacturer	3M
Model	Bondo Auto Body Repair Kit, Original Formula for Fast, Easy Repair & Restoration of Your Vehicle, 1 Kit
Item Weight	1 pounds
Product Dimensions	4 x 4 x 6 inches
Country of Origin	USA
Item model number	310
Manufacturer Part Number	310

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