J-B Weld Multi-Purpose Putty - Quart - Home Exterior & Interior

First of all I want to state that this stuff hardens fast, very fast. Be ready to apply and form this putty as soon as you mix it. Mix it quickly also because as soon as you start the mixing process you activate this stuff and the clock starts clicking. I misused this putty on a fiberglass RV door repair. The stated application does not include fiberglass but it appears to be working for my purpose. One of the reasons I used this product is that I hate working with true fiberglass products. The other reason was that this is off white when curred and the fiberglass repair putty is dark green. It actually smells a lot like fiberglass so I suspect it is in the same family of products just missing the actual fiberglass fibers. That and the color is off white vs dark green. It sands out very easily and you can follow up with additional applications as you complete your repair. Being the cure time is so quick I would recommend that for big projects to work in steps. Build it up slowly. With the quick cure time it works out well that way. You only need a few minutes between applications. As far as reviewers complaining about the container not being full that is because it is actually sold by weight not volume. They list or market it by the container size but that is a little misleading as it is actually sold by weight. It's good stuff.

I used this in a vintage glider restore. I had never used a product like this before. Followed instructions. The only thing I recommend is, DO NOT USE IT IN HOT WEATHER. 60-70 works best. Dries very hard, sands easily. Great product.

Use this stuff to repair the bottom of door jams. Before things get bad clean out the rot fill with this mix. Sand and paint. The bottom of the sill will remain rot free.

This is a good product and works well, but make sure to double check the size when you buy it.I thought I was buying the gallon size and the quart size was delivered to me with no returns.

Sets within a few minutes very solid. Helped me repair bottom of wood door frame.

This is the first time I've used the J-B Weld version of this two-part putty kind of product. I actually preferred it over the Bondo version because its activator is blue (rather than white like Bondo's), which makes it much easier to assess the blending process. Aside from that, I found it just as reliable, easy to work with, and excellent for making flawless and robust repairs in wood, metal, masonry, etc.

Best product for repairing rotted wood beams. Sands well

What a nightmare! I could see where it would be good for cars and metal. But drywall?! Forget it!! I tried it on hairline cracks on my drywall before repainting. First of all, the smell is so overwhelming you must open all the windows. Secondly, it was so hard to sand. The sandpaper binds up in like 30 seconds. You have to constantly change sandpaper. I only did three cracks and was so disgusted, I threw the full container out and went to joint compound.