diff --git a/src/platform/smart_leds_lib.rs b/src/platform/smart_leds_lib.rs
index dac190f..e2c8bde 100644
--- a/src/platform/smart_leds_lib.rs
+++ b/src/platform/smart_leds_lib.rs
@@ -73,7 +73,7 @@ impl<P: Pixbuf<Pixel=T::Color>, T: FastWrite> Output for StrideOutput<P, T> {
     }
 }
 
-pub trait FastWrite {
+pub trait FastWrite: Send {
     type Target: SmartLedsWrite;
     type Color: HardwarePixel;
     type Error;
diff --git a/src/render.rs b/src/render.rs
index 4faa060..9d9b0d3 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -23,18 +23,17 @@ pub trait Sample {
     fn sample(&mut self, rect: &Rectangle<Virtual>) -> impl PixelView<Pixel = Self::Pixel>;
 }
 
-
-pub trait Shader: Send + Debug {
+pub trait Shader: Send + Sync {
     fn draw(&self, surface_coords: &VirtualCoordinates, frame: usize) -> Rgb<u8>;
 }
 
-pub trait Surfaces: Debug {
+pub trait Surfaces: Send + Sync {
     type Surface: Surface;
     fn new_surface(&mut self, area: &Rectangle<Virtual>) -> Result<Self::Surface, io::Error>;
     fn render_to<S: Sample>(&self, output: &mut S, frame: usize);
 }
 
-pub trait Surface: Default + Clone + Debug {
+pub trait Surface: Send + Sync {
     fn with_shader<F: FnMut(&dyn Shader)>(&self, f: F);
     fn set_shader(&mut self, shader: Box<dyn Shader>);
     fn clear_shader(&mut self);
@@ -45,7 +44,7 @@ pub trait Surface: Default + Clone + Debug {
     fn set_opacity(&mut self, opacity: u8);
 }
 
-pub trait Output: Sample {
+pub trait Output: Sample + Send {
     fn blank(&mut self);
     fn commit(&mut self);
 }
@@ -71,7 +70,7 @@ impl<T: Output, S: Surfaces> Renderer<T, S> {
     }
 }
 
-impl<T: Output + Debug, S: Surfaces> Task for Renderer<T, S> {
+impl<T: Output, S: Surfaces> Task for Renderer<T, S> {
     fn name(&self) -> &'static str { "Renderer" }
 
     fn tick(&mut self) {