Painting garage walls - What is this orange stuff?

looks like spray foam used to seal the area. You should be able to cut/scrape the excess off with a sharp object allowing you have a more flush surface to paint

It's spray insulation foam. You can trim it away to make a smooth wall.

I've had that in my home - I believe it's a foam spray insulation as well... helps keep out the cold, heat.

Great for insulating, not so much for painting. I usually cut excess with a utility knife, but, since yours is a big lump, I would remove it with a sharp chisel and hammer. Should come off with a little patience. When you get down to the wall, use a plastic scraper and take care not to gauge the wall. Good luck and stay safe!

spray foam insulation

LOOKS LIKE THEY JUST USED FOAM INSULATION TO FILL IN A SPACE IN THE WALL...USE CONCRETE PAINT, NO BIG DEAL....GOOD LUCK

10-16-2020

Wow! it looks as if someone got serious with the expandable pray insulation!

If it's what I think it is you could cut it away (a serrated knife works great) wo make it more even with the rest of the wall, then perhaps add piece of plywood or paneling cut to size to cover the areas, then paint it all for a cohesive, clean result.

Yup, what everyone else said. It's spray foam insulation that can be cut away. We painted out concrete patio with Benjamin Moore floor and wall paint and it was awesome. I highly recommend it and it can be tinted to any color you like.

Use a long sharp knife and cut it of flush. You can smooth it with sandpaper and top with spackling then paint.

All the other Hometalkers have identified your mystery stuff, when you choose to reshape it, please wear safety goggles and a protective mask.

Thanks guys, this is very helpful!

It's insulation. If it is soft, it's fiberglass insulation but if it's hard (almost foam like) it's the kind that is sprayed in. If that is the case, you can trim it even with the wall and then paint it.

I use a 12 inch hacksaw blade (not in the hacksaw) and bend it at 90 degrees about 1/3 of the way to make a crude handle. Now I have a cheap flush cut saw that is flexible and will trim the insulation flush with the surrounding surface. Easier than going at it with a utility knife blade. You can also use a putty knife. Drive it straight in along the border of the surrounding material making a separation. Then scrape it off flush.

That looks like insulation. There are several brands of spray foam insulation that are easy for home owners to use to seal up drafty areas.

Good news is that it can be cut flush with your walls.

Hello this is the aerosol spray foam insulation it could be removed with a fully retracted tractable knife blade or possibly a very sharp thin putty knife.

The excess insulation just came out of the cavity in volcano fashion.

foam insulation that fills in gaps ... it should not be done like this ..someone was in a hurry or lazy ... just cut off with knife all that exploded