Hey Jig Guy, you have got some good input. The main problem with plastic baits is that the solvents in them are very reactive with many kinds of plastics and paints. Most modern tackle boxes are made of nonreactive plastic, but many small compartmented plastic lure boxes are not.
Clear hard plastic boxes are usually “polystyrene”. Plastic solvents turn this plastic to sticky goo in a hurry. They are okay for keeping hardbaits, jigheads and flies, but do not put soft plastic baits in them.
Look for lure boxes that are rated “plastic safe”. If in doubt, look for polypropylene containers. These are the softer and more flexible plastic, and they are not clear like the bad ones. You can see into them, but not as well. Plastic baits will not dissolve this stuff.
Virtually all of the plastic baggies available are nonreactive to the plastic solvents. Once you have opened a bag from the tackle shop, it is a good idea to keep the rest of your stash in a closeable plastic bag or a nonreactive compartmented box.
In the attached pics you will note that I use a LOT of the polypropylene boxes. In the number one pic, you will see the colors of some of my plastic assortment. I still have plastics, in prime condition, that I purchased over 20 years ago.
Lure paints are another problem with plastics. Don’t let your plastics fall in with your hardbaits. Very costly lesson. Also, be sure you do not toss a rigged jighead with a plastic on it in with the other plastics. Many jig paints are very reactive and will spoil a whole compartment of plastic baits if allowed to remain with them.
I pour and paint all of my own jig heads. I finish them all with nonreactive epoxy paint. Most manufacturers don’t do so. However, the powder paints are pretty nonreactive too.
The advice to keep colors separate is good too. In addition to solvents, plastics contain color dyes, specific to the individual bait. Some colors do not “bleed”. Others will quickly discolor anything else with which they come into contact. Chartreuse is probably the best (or worst) example. Put a couple of chartreuse grubs in with some new white ones and within a couple of days you have all chartreuse. By the way, that is a good way to get full use out of some old discolored whites or pearls. Mix them with some chartreuse in a plastic bag and leave them for a few days to a few weeks. Soon you have some great new chartreuse baits.
Heat does not seem to be a major factor in the meltdown of plastics. I take my lure boxes out into Arizona temps over 100 degrees. Sometimes the boxes get warped but I have never had plastic baits melt together.
If you don’t think those lure dyes are potent, try buying some of that “Spike It” plastic lure coloring liquid. If you dip a grub in that stuff for more than a few seconds it will dissolve. You need a neutralizer to keep your newly dyed plastics from falling apart before you can use them.