Are the dmg skins from the spring event shop perma ?

I was wondering if the dmg skins are perma specifically the hard hitting skin as I dont get what it means by "can be used 10 days after purchase".

Does this mean that after u equip it or w/e the effect goes away OR after 10 days if u dont use it and leave it in your invent then it goes away ?

Also in the description it says "Once used it will be permanently applied" so yeah im confused f3.

I dont wanna spend 1k coins on coming temp.

"Once used it will be permanently applied until another skin is applied."
I think that's pretty clear.
These skins are like hair or face coupons: the coupon itself expires if not used. But if you use it, the effect is permanent.

Ok thought so. Thanks !