Is grinding necessary for a new floor

[Jack A.]

I'm planning for the coating on the floor of my newly-constructed detached garage. I haven't swept up all of the construction debris yet, but the floor is pretty smooth and should not have any stains.

I'm wondering if grinding is really necessary for a new, unused floor. What is the purpose of grinding prior to coating?

 

[bdamico]

yes.
roughing surface to promote adhesion

 

[SunsetsAndFriends]

...

 

[Jack A.]

I'm still debating using a densifier+sealant vs. something like epoxy. Does that make a difference?

 

[LegacyIndustrial]

Yes. Epoxies grind, densifier no grind .


Sent from my iPhone using Tapatalk

 

[Garage Flooring]

I'm still debating using a densifier+sealant vs. something like epoxy. Does that make a difference?

Decide on a product and then decide on Prep.

In general, my suggestions are:

• Epoxy : Grind
• Polyurea: Etch or Grind
• Rust Bullet: Sand or Clean, depending on water absorption
• Densifier & Sealer: Clean

 

[Jack A.]

The amount of prep is one of the factors going into making the final decision. I really like the look of epoxy, but I'm not sure it's the best choice for me. My #1 concern is protecting the concrete from chemical spills (mostly automotive, but also things like paints, varnishes, and thinners). Plus I have a huge backlog of other things that demand my time so spending a lot of time on the garage floor is hard to justify right now.

 

[Armorpoxy]

Hi,
Agree with above that if using an epoxy it's best to grind for maximum adhesion.

If you want something easier/less expensive that will give you the protection, our SPGX one part polyurea you can just power wash and give it a light etch and then a single coat of the SPGX. Runs about 50 cents/ sq ft in clear with GJ discount.

https://armorpoxy.com/products/spgx-one-part-polyurea-coating/