Like to know the epoxy product to coat the exterior wall.

Concrete walls, foundation?
There are epoxy crack fillers, applied from the inside with the part above ground outside covered so it doesn't spill out, but the part underground is OK to leave as is. I bought this online.

There are modern concrete sealers that go on with a roller or garden sprayer, a clear liquid, applied both inside and out. I bought this online too, a 5 gallon pail.

There are the old fashioned concrete sealers that are black thick goopy 'paint' that don't work very well. When I excavated around our 43 year old foundation, it was 95% gone.

The newest procedure is to seal and then cover with a plastic material that looks like small bubble wrap, that lets moisture weep down the inside of it instead of through the concrete. I'm not sure what it's called. I used blue Dow styrofoam panel insulation, a mistake. It doesn't adhere very well and from what I read, after a few years bugs will have made burrows all through it. It's better inside or flat on the soil about 2' down.

Nothing is really foolproof, because concrete is about 18% air bubbles and is very porous.

Agree with joy for the most part. Ive never heard of epoxy coating for exterior walls. There are many products available depending on application but a 2 part product would be new to me unless you're talking about a repair.

I think the insect problem in EPS foam sheathing is overblown in all but very heavy termite areas. You can get products with built in protection, spray after the fact with termite treatment or use mineral wool sheathing.

Precast concrete walls often have PSIs of 5000 or more and are warrantied to keep water out for 10 years although our inspectors usually want to see a coating of thoroughseal.