Control joints filler and epoxy coat

[nomogy]

I like the idea of filling control joint prior to coating floor with epoxy. so I can have nice seamless floor but here is the concern
If control joint is filled with some solid but flexible filler so when there is movement on slab
occurs it can provide flexibility but when epoxy is applied on top of this filler, epoxy is stronger then concrete and it is bonded with concrete very well so when there is a movement it may crack since epoxy coat doesn't have flexibility same as filler inside the joints.

What do you guys think?
Scotty I know you have great 821 gel style filler but how would it address this.

Thanks in advance.

-nomogy

 

[LegacyIndustrial]

Nomogy:
We have found this product to be the best solution for addressing joints/cracks prior to coating. It works under most circumstances.

Remember to prep your slab first, fill the joints and grind flush.
View media item 15656

 

[Carnut12]

If you go into a warehouse like a Home Depot all of there expansion joints are filled, but I am not sure what they use to fill them. It may be silicone which would not allow the epoxy to stick. I am also trying to fill mine prior to doing a floor, but I am not sure what floor I want to go with yet.

 

[LegacyIndustrial]

The older floors will have the product you see above.
The newer floors will probably have a Metzger-Mcguire filler.

 

[Bones35]

If you know you have a section of slab that moves when say a 5000 lb scissor lift rolls off and on it. What product should you use to keep any moisture out?

 

[LegacyIndustrial]

Bones:

HD-821 was born in a warehouse. It elongates pretty well.