Brompton Tire Sealant
 

I've added sealant to my Brompton tires. In fact my wife's front tire was flat when I went to do this from the ride the day before. I added 1 Oz of Stan's to each tube on both bikes. I guess that is about right for the tire size. If anyone else has done this and has something to add please let me know. I did have to change out the front tube on my bike as it wasn't a removable core but all in all it went well and I hope to stop pin hole flats.

IMO the best way to reduce flats is to upgrade to quality tires.

Since I did the same I've had 0 flats.

How much sealant did you use in each tire. How long since you've installed sealant are you flat free. On my mountain bike I've never had a flat in 4 years of tubeless riding. I will add that on my wife's mountain bike that isn't tubeless she's never had a flat in 3 years.

I added slime tube sealant to my fatbike and it rarely needs air top-ups. A plain tube alone loses most air in 1-2weeks, but my fatbike will go for months with no major drop in psi. I just added some to my Brompton with Kojaks so pumped them up to 100psi and will see how much they lose in a week.