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Gluing rocks together...how to

http://www.marcorocks.com/

Michelesreef

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So I had bought some aquarium safe silicone the past week and i feel like it will work pretty well if i put a lot in between the cracks. I am sceptical though because if i out a heavier rock somewhere in the middle and possibly off to the side of another, would it not become top heavy?
Does anybody have other resources or things that will work to make these rocks stay glued together?
 
Lazys Coral House
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Michelesreef

Michelesreef

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Oh, and i get the same thing at a hardware store or it has to be specifically aquarium safe?
 

madweazl

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I used the Marco stuff as well (good deal from a local who didnt use much) and found it easy to work with. I dont think there is anything special about it and the same thing is likely available from the local hardware store.
 
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Michelesreef

Michelesreef

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Thank you! Any advice or is it pretty self explanatory to gluing them together? Not so much with the cement stuff but the process of getting the rocks to look right
 

Big C

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If you use the mortar you'll need to figure out how to prop you rocks up while it dries. Also keep in mind if you ever need to take it out. Don't mortar your entire aquascape together (not sure how much you have). Pretty hard to lift a hundred pound rock out. If it's top heavy you still need to make sure the structure is sound on the tank floor.
 

chowberg

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I also used the e-Marco stuff. It isn't too difficult to use, but as others said you need to be able to prop the rocks up when it dries. I let it cure for a few days in a separate tank and dropped the whole thing into an existing system. I would definitely use it again
 
Lazys Coral House

OutsideBrian

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Depending on what size rocks your putting together you could also use superglue.
The white glue will grow algae on it and disappear or you can sprinkle sand on it to help hide it.
 

S.Pepper

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This stuff works great.
 

Greg P

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2-part epoxies are pretty strong too. Mix/blend well outside of the tank to avoid skimmer upset and avoid overly mucking with it in the tank.
If your structure is large, support it while the epoxy cures.
The brands I'm thinking of are not meant to hold very large pieces of rock, but do hold very well in the proper situations.

I've used Tunze (off market now?) D&D Aquascape Construction Epoxy, and Vertex E-colla (off market ??).
All of these were successful at holding larger rocks together 5+lbs each when fully cured in a tub.
 

Ashish Patel

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If your ever worried about the rock holding, then its probably not a good idea to leave it alone especially knowing how much large colonies will add to the weight of the 2 structures. For larger rockstructures I use acrylic rods and once these are surrounded by expoxy no one is going to be able to bring them apart short of using a hammer.
 

kjbrooks71

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I used the cement for the first time a couple weeks ago, pretty easy; i did make quite the mess. Getting the right consistency is the hardest part. I just kinda pushed into the cracks and propped the rock up til it set up.
 

Eight

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Another vote for E Marco 400. I've tried most methods and this one is amazing.

Here's a step by step photo sequence of how i built my aquascape.

20200205_191724.jpg


 
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