My b2evolution Version: 1.10.x

I've recently upgraded my blog from 0.9.x to 1.10.2 and I've got occasional Google bot requests to files that were located in old skins I had been using under the 0.9.x version... which now generate 404 errors as the files are missing. I'd like to add a Redirect 410 for the /skins/removedskinname folder to block out any requests for files in those old/removed folders...

Redirect 410 /skins/SKINNAME

My question is, if I plan to eventually redesign those skins for 1.10.x, is using a 410 redirect safe? If I eventually rebuild those skins, and remove the 410 statement from the htaccess file, will Google and other bots then begin to re-crawl those directories?

Should I also add each of those directories to my robots file?

jj.