Captcha on notify form. How to?

[franayala]

Hi all,

I solved the spam problem with Keycaptcha all my web forms, but Keycaptcha not protect the notification form.

I refer to the form in which the customer leaves a email to be notified when a product is out of stock for to be notified when the stock is normal.

I've tried using osolcaptcha manually editing the notify.php. Captcha show them, but does not stop the user if the captcha is misspelled.

Anyone know how to insert a captcha on this form?

And... sorry for my bad english!

Thank you!