[HankMcSpank]

I'd to be able change totally clear transparent acrylic so that its outer skin is 'frosted' ...this is so light from LEDs inside the acrylic is diffused.

I'm only talking small parts (a couple of inches)...do you think a rock tumbler grit/sand combination might work?

[lsalme]

How about sandblasting or applying frosted mylar.

[Kipper]

How about sandblasting or applying frosted mylar.

+1 here...seems quicker cheaper and simpler.

[Tsooko]

I'd to be able change totally clear transparent acrylic so that its outer skin is 'frosted' ...this is so light from LEDs inside the acrylic is diffused.

I'm only talking small parts (a couple of inches)...do you think a rock tumbler grit/sand combination might work?

How about a chemical solution? Something you could wipe on, then wipe off?

:cheers:Ted

[Signmaker]

Your best route is probably to use a stock frosted sheet from the Perspex or Plexiglas range. Most UK suppliers have frost in the racks ready to go.

Plexiglas do a stock clear which is frosted on one side only- most other frost sheets have a frost finish on both sides.

If you want to make your own frost effect you have two options. Firstly you can cover clear acrylic in standard frosted vinyl (as used by the sign trade). Second, you can shot blast clear acrylic to create a frost effect. This works quite well but takes practice to get an even frost effect.

As for LED illumination...... frosted acrylic works quite well but for a diffused light effect an Opal White acrylic might be a better option. Opal 050 is the standard grade used on most large illuminated signs. You can also buy other grades; 030, 070 etc.

The Opal numbers refer to light transmission- i.e 050 lets 50% of the light through the acrylic sheet whilst 030 only lets through 30%

[High Seas]

600 grit sandpaper? Acetone? Just a couple of quick ideas. But the tumbler idea might work - but would get all surfaces, including the edges.

Had a minute - I had to do a quick check to verify.

Plain acrylic (unknown specifics--a scrap).

Left side (2 x2 squares) milky appearence from acetone. Looked difficult to control the finish and density of the frosting. Fairly smooth finish, however.

Right side (2x2) squares 240 grit sandpapper. Easy to control amount of frost -- but finish will pick up grit and dirt through time. Could do on inside to prevent that.

Center is paint thinner - -- sorry no laquer thinner to try.

Cheers - Jim