acid-stain won't make a floor weaker OR stronger as it only reacts w/free lime in the cement,,, the knife test for what - the conc your conc sub placed OR was there an overlay applied & then IT was stained ?,,, typically eliteCrete has a compressive strength of 5,600psi w/great adhesion to properly prepared decent conc,,, feel free to call me - we've used their products for nigh onto 10yrs.
as you may know, next week's world of conc but i'll still answer the phone/e-mails - hope to hear from you.
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