Paint prep question

[RScott]

On the Stewart DVD, they say to pressure wash after using the acid etch, being sure to wash thoroughly around seams and rivets.

I have seen some corrosion between pieces that were pop riveted together on a QB kit. Probably sat out in the rain in the Philippines. Corroded in spite of the Alclad and the wash primer.

So, if I pressure wash, forcing that water between the seams under mega psi, won't I be setting it up for corrosion? Will the water just sit there or will it eventually dry out? Seems like is should dry; otherwise planes that are polished, not painted would corrode...But then, why did that QB kit corrode?

[John Clark]

Not getting all the acid etch off and out of the lap joints will cause a lot more problems than some water. A warm spot and good air circulation will take care of any residual water.

John Clark
RV8 N18U "Sunshine"
KSBA