Unless your pads were worn out, most likely they'll squeal again.
I prefer pads of kevlar, that's a trade name so you'll have to look for the generic name which gets a little tricky.  Organic is the usual keyword.

Normal squeal prevention is to keep em clean.
Drilling the disk helps.

On the rear, they don't wear out very fast.  Just check them every tire change.  Several hard stops to drive out moisture helps.  Clearing the dust out helps.  Not that you can do that.  But if you cut the leading edge of the brake shoe so that dust is moved towards the end of the brake it will help.  Almost all brake shoes are ground with a taper that allows the dust to get between the shoe and drum.  That's where your noise comes from.  Cut that taper off with an angle grinder.  Cut it at an angle that will push the dust to the end of the brake.