when not to grind and when to water test

[katilicous]

Hi there, question about the process.
Ok I know for Rust Bullet you dont have to grind the floor, but for almost all epoxy coatings isnt it advisable to get the best adhesion and lifespan by grinding to prep?
There are acids and fake acid etches, but without knowing everything about the history of the slab, dont you always grind? Is it ever advisable with an epoxy coating just to do an etch or is etching for stains and sealers?
Sometimes you shotblast instead to get a rougher CSP so a thicker epoxy can be applied. What situation would warrant a thicker product that requires a higher CSP over one that grinding and applying a thinner, but still professional and pretty thick product on?
Im just wondering what the water beading test is for if youre gonna grind the floor no matter what.
And do you test for water vapor after grinding or before bc it seems like everyone says to do it before but apply the vapor coating if necessary after grinding? Why doesnt the water test happen after the grinding or does it?
Thanks for any help

 

[LegacyIndustrial]

For the most consistent result, grinding is advised.
Thin sealers can get away with acid etching in many cases.

The rule of thumb is: the more material you apply, the further your prep must go....

 

[katilicous]

Thank you so pretry much always grind.
Does the mpisture test come after grinding or before?

 

[LegacyIndustrial]

If you suspect moisture, test before.


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[Armorpoxy]

Grinding is always better than etching, but if you grind this 'opens up' the floor a lot so you most definitely should use the matching epoxy primer as part of the process. This step avoids uneven sheen and absorption issues.

 

[katilicous]

Grinding is always better than etching, but if you grind this 'opens up' the floor a lot so you most definitely should use the matching epoxy primer as part of the process. This step avoids uneven sheen and absorption issues.

By matching you mean its product specific and there isnt a universal primer?

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[Armorpoxy]

We mean you must use the primer from your epoxy supplier, under no circumstances should any type of off the shelf primer or universal primer be used, that would void the warranty.

To our knowledge all of the active vendors on the GJ sell primers for their coatings, or have systems that need multiple coats and are self priming.