How to stop this when painting doors?

[5oysterman2]

Why is this happening?

Using the rollers in photo & what looks like burst bubbles have been left afterwards. What am i doing wrong?

Another thing is, the amount of specks of dust i have to denib between coats is unreal sometimes.

What i have been doing between coats is

Denib.
Wipe with damp cloth.
Use tack cloth.
Strain paint.
Rinse roller & then use masking tape to remove any fluff.
Use a comb on brush to remove particles.

Anything else?????

 

[Wayners]

Never put paint that you have used back in tin.
Never dip brush in the paint tin.
You don't want to contaminate your paint with particulars picked up on brush.
Uee a paint kettle or roller tray.
If you have bits in the paint strain it through some tights.

Sand.
Clean over surface with damp microfiber cloths to remove particles.
Paint surface.
Walk away and don't create any dust the could float in air.

What paint and undercoat you using

 

[opps]

They do look like air bubbles which have burst.

I would recommend thinning the paint slightly and applying less pressure. You can use water or additives such as Floetrol.

Are you using waterbased paint? Like @Wayners I am a decorator. Unlike @Wayners I hate working with (most) waterbased finishes. One of my gripes is that they are a mare to sand flat between coats. I try to use 180g-240grit mesh paper. I suspect that the residual paint that you have sanded back is sticking to the surface that... or that the surface pdaint is ripping very slightly and making it look like "dust".

What are you denibbing with between coats? Are you denibbing the day after?

I haven't used tack clothes since the days when I was spraying furniture with 2K paints. They helped but I would still use a very stiff dusting brush and then use a brush attachment on my dust extractor/vacuum and, occasionally, blast the surface with an air gun.

 

[Wayners]

I wondered if that's fish eye in the paint @opps
I've had that maybe twice over the years but I've always cleaned surfaces

 

[5oysterman2]

Never put paint that you have used back in tin.
Never dip brush in the paint tin.
You don't want to contaminate your paint with particulars picked up on brush.
Uee a paint kettle or roller tray.
If you have bits in the paint strain it through some tights.

Sand.
Clean over surface with damp microfiber cloths to remove particles.
Paint surface.
Walk away and don't create any dust the could float in air.

What paint and undercoat you using

Not put used paint back in tin.
Only dipped brush once in tin & that wasn't using it on doors.
Been using paint kettle.
Run out of tights, using a mesh sieve.
As I was hoping it was last coat, used 240g paper to denib & run lightly over surface.

That's the paint+ their undercoat.