Are scratch cover pens actually any good?

I often see ads for felt-tip pens that claim to "cover paint scratches like magic". Are these products actually any good?

Asked on 3 October 2017 by Penner

Answered by John Slavin
Depends very much upon the scratch. They can, to a certain extent, mask some quite deep scratches - but they're never as good as a proper smart repair by a professional. But if you just want to make a small improvement to the appearance of a scratch without spending a lot of money they'll do a decent job.
Similar questions
I have an increasing number of very superficial scratches on my windscreen. I cannot feel the abrasions if I run my thumb over them and the cause is unknown. Do you recommend any product for treating these...
Is it worth paying £399 for bodywork protection for a new car from Supaguard?
I have just bought and collected a new car. I declined their overpriced offer of paintwork protection. I recall you have recommended in the past a product from Autoglym that will give the same level of...