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Our Garage is very much a garage. Part of the house, but with badly painted rough breeze block walls inside. I want to just smarten it up and somehow give the walls a better finish.
Would anyone recommend spray painting, and if so, what with?
Is there a DIYtrackworld forum that I should check-in on?
Do you mean with emulsion and a lphv system? If you already have one then go for it.
I saw a demo a year or two ago of a Wagner sprayer, I was really impressed. Finish was good and there was very little over spray.
Masonry paint... and a big roller then floor paint after..
Why do you want to spray it? It can be really messy and you'll need (expensive) kit. Just roller it. Won't take long.
I covered my breeze blocks with wood.

This pic has a bike in the way but you get the idea,

I have a sprayer here in Southampton but I would recommend a big shaggy roller and exterior paint for the outside to cover everything quickly and thickly. Inside I used white house paint for the walls with the same roller and the floor was green garage floor paint. I would not use green again as it appears to swallow every dropped screw, bolt or washer.
Why do you want to spray it? It can be really messy and you’ll need (expensive) kit. Just roller it. Won’t take long.
I've tried to roller a small bit, but the coverage was rubbish. Shaggy roller and masonry paint.
Also, it's got a ceiling height of about 12 feet, the street has a slope and it's the downhill side of the house, so a lot of work.
If spraying can produce decent results, there's a tool hire shop I can get a spray gun from locally. Or maybe buy one, as I have sheds and a fence to paint this summer too.
Give it a touch of Banksy.
I’d go for exterior wall paint and a big shaggy roller.
Tried to spray fence panels the other day. Was a disaster. Painting is a disaster too but will complete the job by normal methods. its just messy and no matter how much you mask off you still end up getting it everywhere. Patience is the key I think.
If you use a shaggy roller and the results aren’t good, just claim it wasn’t you. .
A shaggy roller and a big brush similar to the ones you'd use for fence painting. First pass with a roller and then go back with the brush and push/stab it into the deeper bits. Feels like it will take ages but it doesn't really.
I had the erbauer sprayer this https://www.screwfix.com/p/erbauer-erb561srg-700w-electric-hvlp-spray-gun-220-240v/11628
Used it a couple of times, once to paint the outside of a pent shed that was initially orange (from treatment they use) and I painted it blue. The sprayer worked perfectly, went through a bit more paint than I would have with a roller and brush but finish was very even, no runs and much much quicker.
A shaggy roller and a big brush similar to the ones you’d use for fence painting. First pass with a roller and then go back with the brush and push/stab it into the deeper bits. Feels like it will take ages but it doesn’t really.
+1
By the time you've added in driving to the tool hire place, setting it all up, masking off the bits you don't want to spray, etc. Rolling will be quicker.
Very good Martymac 🙂