DIY Climbing Hand Holds




Eastern Mountain SportsThere are plans all over the internet on how to build your own indoor climbing wall like over at Eastern Mountain Sports. But there's only a few well documented ways to make your own holds and well buying them can be expensive! Plus it's more fun to make your own unique holds that no one actually makes giving you new challenges to your own wall.

I would like to thank my buddy Dave for first showing this to me and taking the photos.

There is all sorts of ways to make handholds from wood to bondo to silicone with fiberglass resin and while they all work none of them work well without lots of time lotss of practice and a ton of money spent in materials getting that practice time in.

The Bondo Fiberglass resin + sand yields the best results and is real close to commercial climbing holds you would buy in texture and feel. Silicone holds are extremely expensive to make, it will run you about $5+ to make a mold and then take a few hours to make then cover in silicone. To add insult to injury it will take a few days to dry and at that point you are ready to take a sledge hammer to the work you all ready did and head to the local climbing shop to buy holds.

Don't let my frustration as well as others fool you there is light at the end of the tunnel. What im about to show you is probably the easiest way to duplicate commercial holds or making your own free form holds without a "prototype".


Step 1: Getting Started

Here is what you will need:

- 1 Block of Clay ($5-15 bucks great if you have a student id for that 10% :)
- Bondo Fiberglass Resin (I find getting the 1 gal size is managed easier aprox $20 bucks at home depot)
- Extra Fiberglass resin Fixer (about $2 to 4$ get one or two extra per gallon of resin)
- Play Sand or fine Silica sand (silica works better don't get anything with pebbles or rocks in it, starts at $5 to $10)
- 3/8" Washers (about .50 cents ea you need 1 to 2 a hold)
- 3/8" Mason drill bit for drilling the holes
- a can of WD40

Step 1

Get a block of clay (6" x 6" by 12" is aprox 20lbs depending on the clay type) It can be cheap clay; don't go out spending a arm and a leg on expensive sculptures clay it's just not needed. We will start with cloning a commercial hold first its easier to start with as your first try. Find a commercial hold and cut a slice off of the clay deep enough to accommodate the depth of the hold. Push the hold straight down into the clay with the back of the hold facing up, it is REAL important that you transfer the texture to the clay mold. At this point carefully remove the hold from the clay. Need to be careful not to smudge the texture so this may take a few tries at first. If the plug from the bolt hole breaks off roll a new one from some extra clay by hand. Place a 3/8" washer on top of the bolt hole peg, this is EXTREEMLY important.

Now you want to Spray the finished mold with WD40, this will act as a agent to prevent the poured mixture from sticking to the mold.

Step 2: Mixing the Bondo Resin

Here comes the fun part mixing up the bondo resin. This stuff reeks, so do it in a well ventilated area and you might want to wear a respirator I wouldn't recommend breathing it in. I like to set up a fan behind me blowing towards my work area to blow the fumes away from me. You are going to Guestimate how much sand would fill up the entire mold and roughly measure that volume of sand in ounces to determine how much of the mix you need to fill the mold. So now based on that measurement you want 60% sand and 40% bondo mix.

The first thing you want to do is mix the resin and the fixing agent one drop at a time before adding the sand. It is important to measure the volume of resin carefully so that you can calculate the right amount of fixer to add. The more fixer you add the faster the holds will setup. I generally use the amount suggested but try not to use less.

Now you need to work FAST, the clock is ticking as you only have about 15mins before the resin begins to set and harden!

If you want to add some color to your holds now is the time, acrylic paint works best and you want to add this in before the sand as well. Make sure you get creative :)

One you have all this done and you are set to go on pouring the sand in you want to do this slowly. You want to stir as your pour it in to avoid getting clumps or pockets of dry sand. The sand grains need to all get wet by the mix. The 60/40 mix is a good guideline but keep adding sand until it seems as if more sand would make the mix to dry to work with.

Step 3: Pour the Mix Into the Mold!

Now we can pour the mix into the molds. It is a good idea to have some small holds around in case you mix too much mix so you don't waste any. Pour up to the top of the mold filling it to the brim.

Now we can pour the mix into the molds. It is a good idea to have some small holds around in case you mix too much mix so you don't waste any. Pour up to the top of the mold filling it to the brim. Let the holds cool and set for 1 to 3 hours, this varies based on how much fixer you added. Its ready when the top is hard but the hold is still a bit warm. If you pull it out too early it will damage the texture.

At this point the resin/sand mix is still a bit soft so any little irregularities you can cut off with a knife, I like to use a utility knife. This point you can smooth off the back of the hold by scraping it on any rough surface like the sidewalk :)

Step 4: Drilling

At this point you want to take your holds to a drill press or you can eyeball it and use a hand drill with that 3/8" mason bit we bought earlier. You want to drill down past the washer. Even though the bolt peg got us a starter hole it will never go all the way. So now you just have to let it harden a few hours (let it cure) and bolt them on your wall.

Happy Climbing :)



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44 Discussions


2 years ago

Hi there just wondering how much resin/sand mixture is needed to make each average size hold?


2 years ago

You can create molds with texture just using wet sand in a container, instead of clay. Make your shape and pour in your mold material. If you want extra grip look into grip tape used on skateboards.


3 years ago

The link to is no longer valid. It got hacked and filled with so many viruses Google hated it and banned it. So, it's now at: Hope it helps.


3 years ago

What is the best way to get a good texture if you do not have a professional hold to base the mold off of? I was thinking sandpaper would work, but it might be hard to reach certain areas in the mold.


5 years ago on Introduction

You can pick up professional (everything form shaping foam to plastic) supplies at CWS


5 years ago

Where can I buy inexpensive clay in bulk?!


6 years ago on Step 4

Nice! I might have to try this myself. On your rocks, did you notice any irregularities like bubbles or inconsistencies?
And are these as sturdy as the ones you might buy?
The main reason I'm interested is the ability to customize the holds to any shape. How much money do you save doing this?


6 years ago on Introduction

I found you can get a pre-made mug at


8 years ago on Step 2

is there maybe another name for this 'Fibreglass Resin Fixer'? I can't find anyplace to buy it on its own under that name... that includes Home Depot and Canadian Tire. thanks in advance.

3 replies

Reply 7 years ago on Step 2

The hardener usually is included with the resin. It comes under the white cap that is on the 1 gal.

the home depot website didn't return any search results, so I would recommend just doing a google shopping search.

Typically, it's called "Resin hardener", or "Liquid Hardener". If you go to home depot in the paint department, you'll find the hardener right there with the Bondo Fiberglass resin.


7 years ago on Step 2

Wear gloves and an old long sleeve shirt in addition to eye protection. This stuff can cause some interesting skin reactions that can vary by individual. And its just a pain to get off. Use acetone for cleanup prior to it setting up. After it sets up only time and/or chipping work.

Does anyone know if you can coat your climbing wall with bondo resin? Sounds like that would be just as good as a spray-on concrete coating they use to make "real" rock walls. Your climbing wall would be one big hold, imagine the friction.

1 reply
jf1The Dude of Life

Reply 7 years ago on Introduction

I am looking into creating wooden holds mainly, some of the advice on wooden holds is to use a glue and sand finish at the end.

This could potentially create the grip on the wall?


8 years ago on Introduction

I feel like it would be cheaper to use drilled out nickels as your washers instead of 50 cent ones, about 45 cents cheaper.
It might not be the best though I guess, especially for something semi-crucial to your well being on the wall like that...

1 reply
Flex Zeroyon

8 years ago on Step 2

Depends on what kind of resin you got... Polyester,Epoxide,Urethane,Acrylic...

I assume polyester resin has been used here as it's cheapest and generally suitable for casting,laminating,fibreglass,pouring,hand lay up etc.

"hardener" is also called catalyst and for polyester resin its name is MEKP - MethylEthylKeton Peroxide, mixing ratio is usually 100:2 -100parts of poly resin and 2 parts of MEKP BY WEIGHT,this is important when mixing bigger batch ,I am using ratio of 100:1 - 100:5, 100:1 when working on hot day with pure resin /no fillers,no sand,no pigments/ 100:5 when working on cold day,resin filled with lot of pigments+fillers...
MEKP is strong oxidizer so please wear eye protection,it can cause instant blindness.

i made my holds out of clay and put %100 silicon all over them, now i have about 40 moulds. also im tryin out a new hard rubber resin called Polyurethane. hope it works nice. 


9 years ago on Introduction

I gotta get back into climbing!

Polyester resins are very durable (good idea on your part!) but have you experienced any failures or breakages? I'd be worried about setting a bolt too shallow or in the wrong spot. Then again, that could make for a really challenging, albeit more realistic route!