Be careful! The design and the type will not help much if you show popups too often and will surely not help popups' infamous reputation.
Is this sentence grammatically correct?
By "type" I have to guess you mean how the letters look. Maybe the word you want is "font" or "lettering". Also, what will not help the reputation?
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By "type" I have to guess you mean how the letters look. Maybe the word you want is "font" or "lettering". Also, what will not help the reputation? As it stands, the design and lettering won't, which is not what you mean. Maybe:
Be careful! The design and the lettering will not help much if you show popups too often, which will not help popups' infamous reputation, to boot.