Yes your 8 year old boy should wear diapers again full time during the day and night if he's wetting his pants.
Pampers size 7 diapers should easily fit an 8 year old boy.
I recommend either Pampers Baby Dry size 7 or Pampers Cruisers Size 7 diapers for an 8 year old boy.
The Pampers diapers are a very absorbent diaper brand and are comfortable as well.
All kids should be wearing diapers full time especially if they are wetting their pants during the day.
I wished my parents would've made me wear diapers again full time during the day and night at 8 years old and beyond.
I used to wear Pampers Plastic backed diapers when I was 5 years old, 6 years old and 8 years old and would buy them with my allowance.
I would go shopping in the small store in our town years ago and then buy Pampers Plastic Backed diapers myself even at 5 years old and then sneak them out to our car while mom was still shopping.
Back then there was not much worry about leaving kids out in the car or allowing them to shop alone in small stores.
So I wore diapers at 8 years old but my parents didn't make me or know about it.
If I were your 8 year old son I would happily wear diapers again full time.