JB WELD - Plastic Radiator Repair

So I went searching for - JB WELD Radiator Repair Kit, to fix a radiator for a car I had just bought, until the new radiator I purchased arrived,
He did show me however what not to do, so really most of what is needed is being organised.
Needed,
Gloves
Cut mesh to size before mixing
A small container to squeeze the contents on to after needing (mixing)
I cut the end of the contents where the clear hardener is so when you you squeeze the contents out you get all the hardener needed to remix in your container (mine was an old ashtray)
Clean the radiator around the cracked area
That's it - mix, apply half the contents, apply mesh, apply what's left of contents, or needed - go shopping or chill for an hour
Mine worked fine, and the car got a good run towing a trailer back and forth all weekend...

[tayoni]

Can it withstand pressure even on plastic?