Which popup style to use?

Hello. I'm working on my website updating and I was thinking about pop-up style usage. I do know, pop-ups are not SEO friendly, although I see them in usage on different sites. So I'm wondering about which one to apply: pop over - pop in - pop under - site exit?

Your suggestions?

Thank you.

Guys? Wich one will you recommend to use? Your hint is of great assistance for me!

What is the purpose of the popup?

the purpose is to try to persuade a website visitor to purchase offered products or services

Then you would want to do a normal pop up, or a layer based one, that displays over your content.

Quote:

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Originally Posted by Chris

Then you would want to do a normal pop up, or a layer based one, that displays over your content.

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Thanks for a suggestion, will think about that.
But still I want to gather all opinions so I can make final decision