Here are some uncommon items I picked up at the sign shop liquidation.
This first isn't really unobtainium, just a very good deal for free... All types and colours of Plexiglas from hot fluorescent orange to jet black to clear. I also scored about 50sq feet of lexan in sizes from 1/8 to 3/8ths up to 4' x 4'.

The next is something I haven't seen before. This is some sort of super dense foam. It's just plain heavy. It's about the same density as softwood and nearly as strong. It cuts super clean with no chipping. I haven't tried to identify it yet. I have around 6 sq feet of it up to 3 inches thick.

This next is some pretty cool material. It's a composite of a plastic core laminated on both sides with thin aluminum sheet. It is strong like aluminum and light like plastic. Most of the sheets are painted with high gloss white enamel and protected with blue plastic. I have maybe 50 sq feet in various thicknesses as well as different types of core materials. Some of the really thin stuff has a solid core of some kind. It reminds me of the material named "Glare" that is used to build the A-380. Some of it is aluminum laminated 1/2 and 3/4 plywood. I suspect I could use it as ramps for a truck.

This next is some very unusual black vinyl. The top roll is ordinary gloss black. The bottom roll is also black in ordinary lighting. But, it is also a retro-reflector and when lighted in line with your vision it lights up.

I scored quite a few other items including some very fancy vinyls and a Paasche micro sand blaster. I paid for some of the items but most were free. Oh yeah, I picked up three new neon sign transformers for $10.
Now I have to figure out some sort of organized storage for this stuff.
This first isn't really unobtainium, just a very good deal for free... All types and colours of Plexiglas from hot fluorescent orange to jet black to clear. I also scored about 50sq feet of lexan in sizes from 1/8 to 3/8ths up to 4' x 4'.

The next is something I haven't seen before. This is some sort of super dense foam. It's just plain heavy. It's about the same density as softwood and nearly as strong. It cuts super clean with no chipping. I haven't tried to identify it yet. I have around 6 sq feet of it up to 3 inches thick.

This next is some pretty cool material. It's a composite of a plastic core laminated on both sides with thin aluminum sheet. It is strong like aluminum and light like plastic. Most of the sheets are painted with high gloss white enamel and protected with blue plastic. I have maybe 50 sq feet in various thicknesses as well as different types of core materials. Some of the really thin stuff has a solid core of some kind. It reminds me of the material named "Glare" that is used to build the A-380. Some of it is aluminum laminated 1/2 and 3/4 plywood. I suspect I could use it as ramps for a truck.

This next is some very unusual black vinyl. The top roll is ordinary gloss black. The bottom roll is also black in ordinary lighting. But, it is also a retro-reflector and when lighted in line with your vision it lights up.

I scored quite a few other items including some very fancy vinyls and a Paasche micro sand blaster. I paid for some of the items but most were free. Oh yeah, I picked up three new neon sign transformers for $10.
Now I have to figure out some sort of organized storage for this stuff.
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