Brodissime

Hi all! I’ve been messing with gouache for about a week and I keep running into the same problem. I lay down a flat shape, let it dry completely, then try to add a second layer or a shadow. Instead of sitting on top, the new layer instantly turns the bottom color back into mud and I get these awful streaks. Is this just how gouache works? Am I using too much water? Maybe my brush is too scrubby? I’m using a pretty inexpensive set if that matters. Any beginner tips welcome!

Yeah, that’s the thing with gouache: it’s basically watercolor that dried but wants to wake back up. If you’re brushing over a dry layer with a wet, watery mix, you’re reactivating the gum binder. First fix: try a thicker, creamier consistency—like melted ice cream, not tea. Load a soft flat, lay it in one or two strokes, then leave it alone. If you scrub, you’re dead. Also make sure the first layer is genuinely dry, not just touch-dry. Cheap sets are often chalky and lift more, but you can still practice.

Thanks Woolgatherer, that explains a lot. I was basically doing watercolor glazes over gouache and wondering why everything went gray. Quick question—would switching to acrylic gouache stop the lifting? I heard it dries permanent. Or would a hair dryer help me not wait so long between layers? I’m not patient.

I just tried the thicker mix thing after reading this thread and it helped a little, but now my second layer goes on patchy, like the brush skips and leaves bald spots. Is that because the paper is too rough? I’m using cold press watercolor paper. Also, does white gouache under a color make lifting more likely? I was using white to make an area opaque first.

Ooh yes, I want to know about paper too. I’ve only got a mixed media sketchbook and the page gets kind of fuzzy when I layer. Would hot press be easier for flat gouache shapes? I keep blaming my brush but maybe it’s the surface. Do I need a different brush as well? I’m using a round watercolor brush that’s probably too soft.

Okay, I tried the thicker paint advice and it is better! No more instant mud. But now I have a new problem: the top layer goes on streaky and I can see brush lines in the dried paint. Am I not loading the brush enough? Should I add a tiny bit of water after I pick up paint? Also thank you everyone—this is the most helpful rabbit hole I’ve gone down this month.

BobbinHobbit: acrylic gouache won’t reactivate, but it also won’t blend the same and it can look plastic. Keep a little dish of regular gouache for practice. PalettePilgrim: streaks usually mean you’re reworking the stroke. One pass, full brush, don’t go back over it. If the paint is dragging, add water to the mix before you start, not while it’s on the paper. A soft flat brush is much better than a round for smooth areas. TinyAwl: hot press is smoother, but you can use mixed media if you don’t scrub.

That hair dryer experiment went sideways. I blasted my first layer until it was bone dry, then put a thicker layer on top. Now the first layer has little cracks showing through. Did I dry it too fast? Or maybe my paint was too thick? InkSplot, I also got the patchy skipping thing on cold press, so maybe paper is part of it.

BobbinHobbit, I think I did the same crack thing once when I used gouache straight from the tube without enough water. It dried like old plaster. Maybe add a bit of water to the first layer even if it feels less opaque? I’m going to try hot press paper next time just to see if the patchiness goes away. Does anyone else find gouache looks darker when it dries, or am I imagining that?

Okay, small update: I switched to a synthetic flat brush and used less water, and the patchy skipping got better on the same cold press. I think my round brush was not holding enough paint. TinyAwl, yes! My purple dried way darker than it looked wet, and then my second layer looked dull. Does that mean I should mix lighter than I think? Also, do you all varnish gouache or leave it?

That drying shift is normal—gouache dries to a matte, chalky finish, and darker colors can look deeper. Mix lighter deliberately if you’re layering. Varnishing is a whole other can of worms: it changes the surface and can make matte gouache look like bad acrylic, so I’d skip it for sketchbook work. If you want the paint to survive handling, keep it in a pad or frame it behind glass. Don’t chase perfection. The best way to learn gouache is to let it be a little ugly while you figure out the timing.