Is it a good idea to second seal Frederick?

I have recently started a new campaign of Fire Emblem: Awakening, and I've been trying to use units that I rarely use to try and have some variety. One of these units is Frederick.
As many of you know, the amount of experience he gets from killing/wounding enemies is much less than the average unit. I have got a second seal in my inventory (I've already second sealed Donnel, so I don't need to use it on him) and I just finished chapter 8.
Would it be a good idea to use the second seal Frederick back to a cavalier or should I keep him as a great knight?
Thanks in advance
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When should I use second seals in Fire Emblem Awakening?
In general, when a character hits level ~15-20, use a Master Seal to move them to an advanced class. When you hit around 15-20 in an advanced class use a Second Seal to move them to another class.What does Second Seal do?
The main function of Second Seals is to allow units to re-class into other classes belonging to other class sets in order to obtain skills to use. For pre-promoted characters, doing so allows them to "reset" their level, helping them to catch up with non-promoted units stat-wise.How do second seals work awakening?
More tactically, you can use Second Seals to change classes multiple times. Each time you do this, your character will return to Level 1. That said, their stats will remain largely intact, allowing you to pump them up even higher as you work your way back to the level cap.Where do you get second seals in Fire Emblem Awakening?
You can get Second Seals from the Mila Tree after chapter 16, or if Cordelia is already married, completing Paralogue 10 and getting them after chapter 14.11 Frederick's Experiment
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