Hi Stealth,
Two reasons:
1) I didn't want sand lying inside the rails just adding to the mix of crap in there, keeping moisture locked in a adding to corrosion. Last shell I got sandblasted still had sand filtering out of it six months later despite numerous attempts with the compressed air and vacuum trying to get it all out of the nooks n crannies.
2) KBS systems state that the paint gets better adhesion of the chassis is left in a rough (read: rusty but not scaly) state as this rough texture promotes adhesion.
Hope this helps.
Cheers,
Tricky


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