AXT550 Hardener 2K Spray Putty
AXT550 Hardener 2K Spray Putty
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AXT550 is a 2K spray putty hardener (activator) used in automotive refinishing systems — most commonly in Cromax sprayable polyester putties like 799R.
What it is
- Full name: AXT550 Hardener for 2K Spray Putty
- Type: polyester spray filler activator (hardener)
- Used in sprayable body fillers / spray putties, not clears or primers
What it’s used for
AXT550 is mixed with spray putty systems such as:
- Cromax 799R sprayable putty
- Similar 2K polyester spray fillers
It helps the product:
- Chemically cure and harden
- Build a sandable surface layer
- Fill minor imperfections, sanding marks, and waves

