How much amount of soap should I use with a badger brush with 28mm SHD knot?

I have a badger brush from Oumo and it has 28mm manchurian SHD knot.

Whenever I use this brush, I see the lather in the hairs and it doesn't come out of them well.

So I always squeeze the brush and apply the lather on my shave area with my hand.

Do you guys have any tips for making the lather come out from a badger brush when lathering?

I have boar one and synthetic one but they are very nice in lathering.

I just have a difficulty with badger one..

Lather is retained in the spaces between hairs of a brush. Since badger hairs are quite fine, when you have a 28mm knot packed to super high density, you have a huge number of such spaces. I have a 28 mm SHD knot, but find it is difficult to use. I much prefer 24-26mm brushes. A 24 mm SHD brush will have only 73% if the number of hairs as a 28mm brush.

Boar bristles are far larger in diameter than badger hairs. Thus, there are fewer bristles and fewer spaces into which lather can be trapped.

Synthetic brushes come in a variety of fiber types, but they are somewhere between boar and badger in diameter.

Make sure your lather is properly hydrated. If your lather does not incorporate sufficient water, you will have difficulty extracting it from the badger brush.

More soap, more water.

Great question!  And RayClem did an amazing job of answering the why.  28mm is a large knot but I suspect it’s a great feeling one (and I love fat knots) but big badgers are prone to holding on to a ton of lather.  If you become addicted like many of us here, and have too many soaps, the answer is truly more soap and more water. I’m suspecting that 28mm badger needs twice as much soap as your synthetic knot does.  One trick you may choose is to wring the base of the knot between thumb and index and push lather up into the tips where you can paint on lather for your second pass.  Yes sir, that big badger is not going to be as economical as your other brushes but that big poof of luxury is worth it I’d think.

I would suggest two things to start with. The next 2-3 times you use that brush, also use the same soap. My guess is that you may need a bit more product so I'd say try using twice as much product that you normally use. I think with a knot like that, you're likely getting enough water. Just see if you can start a bit drier and/or get more product in the loading.

As much as you need to get a decent shave!!

Lather is retained in the spaces between hairs of a brush. Since badger hairs are quite fine, when you have a 28mm knot packed to super high density, you have a huge number of such spaces. I have a 28 mm SHD knot, but find it is difficult to use. I much prefer 24-26mm brushes.  A 24 mm SHD brush will have only 73% if the number of hairs as a 28mm brush.

Boar bristles are far larger in diameter than badger hairs. Thus, there are fewer bristles and fewer spaces into which lather can be trapped.

Synthetic brushes come in a variety of fiber types, but they are somewhere between boar and badger in diameter.

Make sure your lather is properly hydrated. If your lather does not incorporate sufficient water, you will have difficulty extracting it from the badger brush.

More soap, more water.

Great question!  And RayClem did an amazing job of answering the why.  28mm is a large knot but I suspect it’s a great feeling one (and I love fat knots) but big badgers are prone to holding on to a ton of lather.  If you become addicted like many of us here, and have too many soaps, the answer is truly more soap and more water. I’m suspecting that 28mm badger needs twice as much soap as your synthetic knot does.  One trick you may choose is to wring the base of the knot between thumb and index and push lather up into the tips where you can paint on lather for your second pass.  Yes sir, that big badger is not going to be as economical as your other brushes but that big poof of luxury is worth it I’d think.

I would suggest two things to start with. The next 2-3 times you use that brush, also use the same soap. My guess is that you may need a bit more product so I'd say try using twice as much product that you normally use. I think with a knot like that, you're likely getting enough water. Just see if you can start a bit drier and/or get more product in the loading.

As much as you need to get a decent shave!!

Thank you all mates

I finally got nice, decent lather with the badger brush and had BBS shave thanks to your advice.

I put more soap into the bowl and more water accordingly.

I started to lather pressing the brush a bit more than I did last time and then got perfect lather

Thank you again!