Can I put Epoxy-Coat over DAP 3.0 Concrete Sealant?

NoleenELT · Jul 22, 2014

Hello,
Last weekend I prepped my garage floor for epoxy-coat by diamond grinding it. I had one thin but long crack across the floor which I wanted to fill. I used DAP 3.0 Self-Leveling Concrete & Masonry High Performance Sealant, which says "paintable" on the package. Unfortunately, as I was smoothing the sealant, I spilled/smeared some of it on the concrete about 1" on either side of the crack about 6-8 feet long.

http://www.dap.com/product_details.aspx?BrandID=190&SubcatID=27

Now I'm worried that the epoxy will not adhere to this area. Do you think that I Should be concerned?

If so, any suggestions on how to remove the sealant and re-prep this area?

I also filled the cracks at the bottom of my expansion joints with a thin bead of the same stuff.

Thanks in advance!

NoleenELT · Jul 23, 2014

I think I'm going to purchase an angle grinder and small diamond wheel to clean up that section.

benwah · Jul 23, 2014

I wouldn't, but that's my opinion. You should fill cracks with a surfacing epoxy so you have a compatible surface to adhere to.

NoleenELT · Jul 23, 2014

benwah said:
I wouldn't, but that's my opinion. You should fill cracks with a surfacing epoxy so you have a compatible surface to adhere to.

Maybe I'm misunderstanding your reply, but did you read the whole post? I already sealed the cracks with the stuff I posted and made a mess of it. I'm trying to figure out if I am still OK, or what I should do to fix the situation.

The epoxy-coat website recommends using a product similar to that, but I assume that they don't expect you to smear it on the concrete surface.

benwah · Jul 23, 2014

Sorry, busy day here!

What I was saying is: I, personally, would not apply epoxy over DAP 3.0. At all. Ever.

I am not sure what Epoxy-Coat recommends, I would suggest calling them. They may say it's okay.. I would still be cautious though. I work mostly on the industrial side of these coatings and if a contractor were to use a silicone caulking like this they'd probably lose their contract, or have to re-do it properly. Even in residential garages I use a 100% solids surfacing epoxy with fumed silica mixed in.

Usually applying epoxy over a silicone caulk like this will lead to adhesion issues and cracking of your epoxy floor, because that stuff is flexible and your epoxy floor is not.

If I were you, I would remove the silicone and fill the crack with your 100% solids epoxy mixed with fumed silica. Depending on the depth of the crack you may not even need the fumed silica, but contact Epoxy-Coat and see what they say.

NoleenELT · Jul 23, 2014

Is a wire stripping brush on a drill followed by cleaning a good way to remove it?

EpoxyCoat2 · Jul 23, 2014

For some reason DAP contains an ingredient that does not allow our epoxy to bond with it. I would remove the DAP that you have already applied, and re-patch with our Concrete Patch Kit.

NoleenELT said:
Hello,
Last weekend I prepped my garage floor for epoxy-coat by diamond grinding it. I had one thin but long crack across the floor which I wanted to fill. I used DAP 3.0 Self-Leveling Concrete & Masonry High Performance Sealant, which says "paintable" on the package. Unfortunately, as I was smoothing the sealant, I spilled/smeared some of it on the concrete about 1" on either side of the crack about 6-8 feet long.

http://www.dap.com/product_details.aspx?BrandID=190&SubcatID=27

Now I'm worried that the epoxy will not adhere to this area. Do you think that I Should be concerned?

If so, any suggestions on how to remove the sealant and re-prep this area?

I also filled the cracks at the bottom of my expansion joints with a thin bead of the same stuff.

Thanks in advance!

NoleenELT · Jul 23, 2014

Thanks for the reply. How do I remove the old stuff?
I spoke to Cathy @ epoxy coat and she recommended using liquid nails to cover what I can't remove of the old stuff. It's a very thin crack.

NoleenELT · Jul 23, 2014

I picked up a wire stripping brush from Home Depot and removed as much of it as I could. It returned to a rough texture like the rest of the concrete, but I can still feel that some of the caulk is in embedded in the concrete as it does not have the dry dusty feeling of the rest of the prepped concrete.

Should I buy a 4" diamond cup wheel and an angle grinder, or is there a better method to remove the remaining (chemical, etc)?

Thanks for all of the help so far.

EpoxyCoat2 · Jul 24, 2014

NoleenELT said:
I picked up a wire stripping brush from Home Depot and removed as much of it as I could. It returned to a rough texture like the rest of the concrete, but I can still feel that some of the caulk is in embedded in the concrete as it does not have the dry dusty feeling of the rest of the prepped concrete.

Should I buy a 4" diamond cup wheel and an angle grinder, or is there a better method to remove the remaining (chemical, etc)?

Thanks for all of the help so far.

The diamond cup wheel sounds perfect. Just try to get as much off as you can. The diamond cup wheel/angel grinder should do the job.

NoleenELT · Jul 24, 2014

The diamond cup wheel made a huge mess of dust, but cleaned things up quite quickly.

I'm starting the epoxy tomorrow, I can't wait to get this project finished!

EpoxyCoat2 · Jul 25, 2014

I would love to see pictures when you are finished

pavankv90 · Jul 13, 2023

Hi… I made the same mistake of putting self leveling sealant in between contraction joints. How do I remove it?

benwah · Jul 25, 2023

Snap blade utility knife

pavankv90 said:
Hi… I made the same mistake of putting self leveling sealant in between contraction joints. How do I remove it?

Can I put Epoxy-Coat over DAP 3.0 Concrete Sealant?

NoleenELT

Member

NoleenELT

Member

benwah

Well-known member

NoleenELT

Member

benwah

Well-known member

NoleenELT

Member

EpoxyCoat2

Well-known member

NoleenELT

Member

NoleenELT

Member

EpoxyCoat2

Well-known member

NoleenELT

Member

EpoxyCoat2

Well-known member

pavankv90

New member

benwah

Well-known member