If you want diffusion and protection, the solution designed for this is silicone channels:
They come in all sorts of shapes and sizes. Make sure you check which LEDs you have.
US $3.98 30%OFF | SK6812RGBW LED Neon Rope Tube WS2811 WS2812B WS2813 Flexible LED Strip Light Silica Gel Soft Lamp Tube 1m - 5m IP67 Waterproof
https://a.aliexpress.com/_mKKX9QM
I needed at 90deg angle change, so mine are much larger, but they work excellent and still put out a lot of light
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