Fixing some bubbles in paint coat before doing second coat

ashe

I've just recently painted my stairs and we gave it a cost of zinsser gardz as looked like old owners used a vinyl paint and we used with filler on uneven parts. Walls were sugar soaped and cleaned before gardz coat

It looks 900% better but in one small part we have some small bubbles which are bugging me. 

I was thinking to sand down with high grit sandpaper before the second coat and hope they don't come back? I am tempted to do another layer of gardz but didn't know if it would be obvious where this had been done? 

Rest of hall/landing/stairs is fine so it's a bit annoying to have it happen in this one small part

rob7475

I'd try rubbing that back with some 120/180 grit paper before painting again. Did you paint it with a roller? It may be that you just didn't lay off that bit properly so the paint has bubbled a bit.

ashe

rob7475 said:

I'd try rubbing that back with some 120/180 grit paper before painting again. Did you paint it with a roller? It may be that you just didn't lay off that bit properly so the paint has bubbled a bit.

Yeah standard 9 inch roller, it's farrow and ball paint and find it does go on a bit bubbly but this is like bubbles from underneath

Ben1989

Are you sure it's bubbles and not bits of fluff from the roller when you first started applying paint?

ashe

Ben1989 said:

Are you sure it's bubbles and not bits of fluff from the roller when you first started applying paint?

It's 100% bubbles as it bubbled up right away. The section is in the middle of the wall and the rest of the wall is ideal, it's just this one section