Icebox Insulation

I'd go with styrene foam and put a rigid skin on the inside like Formica or some such.

I don't think the reflective surface buys you much, but someone else may not agree.

I once put 1 inch foam inside a large ice chest, then put a layer of glass cloth/epoxy over that for one of my fishing friends. It was a lot of work, but it he loved it.

Foam is my choice, too.

This looks like the ticket. It's self adhesive, and with the reflective layer facing in, it will give you a nice clean look.........................easy too! This or something similar should be available at any HVAC supply house.

how well do you think this will handle cleaning up of food spills?

Before I offer any advice I need to know something. Can you see a evaporator coil? Or do you have a chill plate and an Evaporator Pressure Regulator?

evaporator coil incorporated into the sides of a tiny freezer

thanks

Assuming the coil has some type of a fan you have to be careful not to impede air flow. If you do all your work will cause more problems that it solves. Depending on how much you can access I suggest you insulate as much as you can behind the coil areas on the outside of the box. You might be able to drill a couple of small holes and run a straw in them that's connected to a can of spray foam. Get the type of foam that doesn't expand too greatly or you can have bulging issues. Marine boxes are known to leak quite a bit on the access door seals. Before you even start thinking about insulating further really take a good look at that. You might end up just placing a piece of hard foam over the door when you aren't actively accessing the freezer. I wouldn't add insulation on the inside, it will do very little for you. Your box is probably stainless, and it conducts heat easily. Any spot you fail to cover will still act just like a heatsink and you'll gain heat.

So..1. Check that door seal and replace it often it becomes hard, cracked or separated.

2. Insulate the outside with sprayfoam if possible.

3. Don't impede airflow...airflow is your friend.