problems with alcad II!

DJB wrote:

help! i recently bought an f-86E sabre and sprayed an undercoat of alcad gloss black.

You need to use a gloss black undercoat only with Alclad 2 Polished Aluminum or Chrome.  For all other metallics, use any color primer.  I use Mr Surfacer 1000 or 1200.

DJB wrote:

when i applied the top coat the alcad dried and left like white marks on the aircraft. it only happens when i use the airframe aluminium paint and not with the other colours in the alclad range. is the paint faulty or is it me. i also spray all my paints at a low,reccomended psi. thanks

I had similar results with Airframe Aluminum recently with paint from the same bottle I had used successfully on an earlier project.  I sprayed it on the same model next to areas with several other Alclad 2 colors and got a flat white streaking.  It looked like corroded aluminum and tended to rub off.  So I rubbed it off, but didn't strip it--I had too many hours in masking and spraying a half-dozen other Alclad metallics in the model to do that, and there is a deadline for the project.  I sprayed a Alclad 2 Semi-matte Aluminum over the area, and it covered.  I think the paint had gone bad.  I bought a new bottle and it worked fine on a test shot.  I think it's the paint, and neither you nor the undercoat were the cause.

Regards,
Bruce

I have read of problems using the alclad primer. Personally I use Tamiya semigloss black for my Alclad and it works great.

Theonly thing I could suggest is strip it off and start over with Tamiya or Gunze black. What exactly do the white marks look like? how is your humidity, you may be experiencing either blusing or the primer evaporating through the Alclad leaving what looks like blush, only from the underside as water and other solvents try to escape. Increase your dry time for your base coat.

HTH

David