Several questions.

[buildersbutt]

Hi all as above.
Have a hairline crack on internal wall, what's the best way to eradicate and filler?
Need a 12" roller for emulsion, recommendations please, not silly money!
Exterior wooden window keeps peeling, process and paint required please!

Thanks for your time, appreciated.

 

[Doggit]

Depending on the width of the crack, use fine filler. You can get 12" general purpose rollers from Screwfix, and bits from Wickes as well. As to the exterior windows, you rub it down, clean off the dust (if at bare wood then prime first) and undercoat twice, then topcoat twice.