Two-Part Potions

Most potions are pre-mixed concoctions with an indefinite shelf life. These ones are extremely volatile and have to be stored as separate reagents until they're ready to be used, then you mix them together and stand back. They're perfectly safe if you follow the directions and are careful. Really. Don't worry about it.

Casting Putty (Copy Paste)
Comes in a kit containing: 1 mixing cup, 1 stir stick, 1 gallon jug of liquid putty precursor (Cherenkov blue), 1 eyedropper bottle of curing reagent.
Fill the mixing cup with liquid putty to the fill line and add exactly 7 drops of curing reagent. Stir until the mixture becomes thick and gray, then pour over the item you want to make a mold of. The putty will spread itself evenly over the object and harden into a thin, translucent shell before cracking away in neat sections.
To create your castings remove the original object and reassemble the shell sections. The empty mold-shell will create a superficially perfect duplicate of the original object in any material you request. It cannot reproduce internal structures or moving parts. One mold-shell can produce 1d12 duplicates before crumbling to dust. Each kit has material to create 6 mold-shells.

Onmihesive
Packaged in metal boxes with hinged lids and two compartments. One holds a screw-lid can of glue and the other a small atomizer bottle of catalyst.
Coat the surfaces you want to bond with a thin layer of glue using the brush on the inside of the can's lid. Spray the surfaces with catalyst, then press together and hold in place until cured.
Omnihesive creates a literally unbreakable bond, gloves are highly recommended. Open time is 6 seconds.

Hypermelt
Distributed in flexible plastic tubes protected inside a heavy-duty metal outer tube with a screw-off top. The inner tube contains a soup of reagents and sealed glass ampules of catalyst. One end is prominently marked with arrows, indicating the plastic there is thinner, designed to dissolve first so you can direct the acid spray.
Remove the inner tube from the outer metal casing and activate it by bending it until the glass ampules crack. (Be sure to break them all for best results.) Shake until warm, then point the end marked with arrows at the object you want to destroy. If the tube doesn't start spraying acid within 10 seconds or becomes uncomfortably hot, drop it and run.
Hypermelt is an aggressive, explosive acid that will dissolve practically anything, even magic, and the few things it can't destroy it corrodes into ruin. Don't touch the residue, don't breathe the fumes. Gloves are useful for moral support, but functionally useless. One tube can dissolve up to 100 cubic feet of material.

Mixtanium (Viridian Stuff)
Packaged as two sticks of clay, 1 yellow (2lb) and 1 blue (1lb), wrapped in resealable plastic film inside a plastic tube.
Mix 1 part blue to 2 parts yellow until soft and evenly green. Apply to the item you want to mend and/or sculpt as desired and allow to cure.
Mixtanium is a space-filling adhesive putty that can be easily shaped and is indestructible once cured. The cured putty isn't magical, but reacts to detection spells as if it were. Curing time is 12 minutes. Harmful if swallowed.

Orange Stuff (Liquid Dragon)
Comes in a sturdy cardboard box. Two bricks of firm clay, 1 red (12oz) and 1 yellow (12oz), individually wrapped in reusable metal foil.
Mix equal amounts of red and yellow until evenly orange and warm. Apply to the surfaces you want to weld, press together (clamp if necessary), and retreat to a safe distance.
Orange Stuff is a self-igniting pyrotechnic compound used for welding in remote locations. It burns hot as dragonfire and will weld any metal (or slag anything else). It works underwater and cannot be smothered. Do not use in enclosed spaces. Wash hands thoroughly after use. Working time from activation to ignition is 6 minutes.