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Durham's Rock Hard

Model # DU-4

Internet # 202535298

Store SKU # 865311

DU-4 4 lb. Water Putty

This item has been discontinued.
The Home Depot no longer carries this specific product.

$7.98 /each


Model # DU-4

Internet # 202535298

Store SKU # 865311

For 80 years, Durham’s Rock Hard Water Putty has been making repairs in wood, plaster, drywall, stone, tile, concrete and other stable surfaces. Just add water to this powdered material, apply it into voids, cracks and holes. When thoroughly dry, it can be sanded, drilled, sawed and painted. Repaired areas are very hard and long lasting. Durham’s can also be cast or molded to reproduce missing trim pieces or in handicraft or artistic applications.

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Product Depth (in.) 
Product Height (in.) 
Product Size (oz.) 
Product Width (in.) 
Drying Time (hours) 
240 h 
Paint Product Type 
Wood Filler 
Patching & Repair Product Type 
Wood Restoration 
Product Weight (lb.) 
4.34 lb 
Shrink Resistant 


Rated 4.3 out of 5 by 11 reviewers.
Rated 5.0 out of 5.0 by Amazing stuff. does exactly what it's name is. This stuff goes in like water, so, seal up all your cracks. sets like a rock. prepare to pre-drill your holes. fills all the knoocks and crannies, then turns hard, hard, hard, Not brittle, like cement, takes screw threads w/o cracking. Adheres to every substrate I have challenged it with.... If, your wood is rotten, drill some holes, pound until the loose stuff is out. then fill'er up, better than new!! Love it!! Way cheap for what is does!! excellent performance!! I leveled concrete stairs with this stuff( 1" thick) in 1991. I have moved but it is still there today (2012). I fixed door jams in rental houses, they are still swinging solid.. Still there. August 6, 2012
Rated 5.0 out of 5.0 by I love this stuff. I use this stuff for patching all holes and dings in the walls of my apartment because apparently the walls are made of sand and chewing gum. :/ It dries fast and lasts forever. I am going to try it on repairing the nail holes in an old vintage sofa I am reupholstering, and I think with the added flex of the wood that I am going to try mixing it with both water and wood glue to give it a little more flex, as the product is very stiff when mixed with just water. If you need more flexibility out of your product for certain jobs I would try it, though it lengthens dry time. January 9, 2015
Rated 5.0 out of 5.0 by Works great! I use this product to patch holes caused by carpenter bees in my cedar siding. It works great at filling large gaps and deep holes, and dries hard as a rock. Once dry you can sand it, and paint it. Very good value for the price. May 2, 2015
Rated 3.0 out of 5.0 by Best alternative putty for wood but still not up to par The item is good if there are no other real choices for filling gaps and cracks etc. However we did have a hard time of it cracking or not hard after sitting for 48 hours and ended up using another product that got the job done. Its good for smaller fills but imo larger spaces up to 1/4 inch it doesnt seem to hold well. April 29, 2015
Rated 4.0 out of 5.0 by Great for patch jobs Needed this for an old beat-up door and jamb on retail. This did great on the door and jamb, filling a cracks and even a missing chunk in jamb. Sands down very well for painting. The one thing it did not do well was hold screws. I still needed a larger strike plate for the damaged door jamb. June 17, 2014
Rated 5.0 out of 5.0 by Every Home Should Have Some! I used this product to repair some wood rot on an outdoor window sill that was above sight level. It did a great job! I didn't know how to replace the wood, and I didn't really know any carpenters to call, so I thought I would give this a try after reading how to repair wood rot on the internet, some people recommended using Durham's Rock Hard. I made a form to match the line of the window sill out of wire fabric and stapled it to the good wood, and I mixed several small batches of Durham's Rock Hard up and put on thin layers and let each one dry until it was built up and molded to match the window sill. I painted it, and the finished job looked great! It's very economical to use. You have to make small batches, because when it starts to set up, there's a small time that you can work it before it gets hard. You should make a small batch to get used to the qualities before you apply it to your project so you know what you're working with. I found it easiest if you have to make several batches for a larger job, is to mix up the Rock Hard in something plentiful and disposable- like paper cups or styrofoam bowls, and throw them out after each batch, and use a plastic putty knife and keep a bucket of water handy to rinse your tools in. I have an old house, and I also used Rock Hard to fill in places on the exterior where the paint was chipped and had been repainted. I mixed up small batches, and used a putty knife to smooth them out, and blended them with a wet sponge, and painted them when they were dry, and the finished product looked good. I hope this review is helpful, I needed several batches, and I just ran into the problem of running out of containers to mix it before I figured out to use the disposable containers, which made the job easier. February 28, 2013
Rated 4.0 out of 5.0 by Good cost efficient product very cost efficient. Sets quick and hard (do not waste time); after sanding becomes part of whatever was being patched. Very durrable June 17, 2012
Rated 5.0 out of 5.0 by Great Product Need to stock the 1lb. size. 4.4lb will last my grandchildrens lifetime August 10, 2012
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Store Exclusive. This item is available for purchase in select stores only.