Priming Quick Build fuselage with AkzoNobel epoxy primer

[longline]

The kit that I am finishing was a 2002 slow build. I think, but do not know for sure, that the original builder used the same stuff Van's uses. Prep was not good, as some areas of the wash primer were... shedding. I would make sure that what you have is adhering well. If so, scuff and prime. It is a pain to take off the Van's product.

[Maxrate]

I think there may be some misunderstanding on the 48 hr paint requirement. All epoxy primers that I have worked with in the past, weather PPG, SW or similar require a topcoat within 48 hours. After that general timeline they cure and loose the ability for the paint to chemically adhere. After the 48hrs a mechanical surface prep (sanding) is required for proper adhesion. If the kit is a QB of course the 48 hrs has passed and a light scuff of the vans P60G2 would be required for the paint to be able to grip the surface. Reapplying primer is not required in this case just a light scuff. This is in reference to the OP.

[mike newall]

Spring has arrived I see..........

[Tmartin66]

The general consensus is it needs to be scuffed. Then Scuff it is.

Thanks all.

[oren_rokach]

Hello Martin
i am facing same issue now, as my QB is on its way
what have you decided to do? did you apply a primer on top of the P60 wash?

[mfleming]

I'm getting ready to paint my QB interior using JetFlexWR.

I talked to all manor of Sherwin Williams reps about if I needed to scuff and paint or scuff, primer and paint. None of the reps could find any literature saying what to do after the P60G2 wash primer had cured.

So I'm getting ready to scuff, clean, epoxy primer and paint.

[wirejock]

Originally Posted by mfleming

I'm getting ready to paint my QB interior using JetFlexWR.

I talked to all manor of Sherwin Williams reps about if I needed to scuff and paint or scuff, primer and paint. None of the reps could find any literature saying what to do after the P60G2 wash primer had cured.

So I'm getting ready to scuff, clean, epoxy primer and paint.

They gave me a similar song. I asked if P60G2 was an adequate primer. I got all kinds of sales rhetoric about using the SW primer for Jet Flex. In the end I ran tests. Turns out it stuck just fine and passed multiple Gorilla tape tests. I think I coiuld have sprayed it right on the aluminum and it would have been fine.
Bottom line, test it. Scuff a test piece with 400. Clean and spray. Wait for cure and see how it sticks. I suspect it will be fine and you may save some weight in a layer of primer.
I have lots of scraps sprayed with P69G2 if you need for testing.

[Tmartin66]

Scuff, wipe down with a mild degreaser that I purchased (a SW product), primed with Akzo, then painted with Jetflex. So far so good. Still building though.

[thekubiaks]

I too am waiting for my RV14 QB Wings and fuselage, so if I understand this discussion. The QB wings and fuselage are wash primed by Vans builders. When you take delivery, you guys are wanting to paint the internal fuselage (JetflexWR) and trying to figure out if the paint will stick to the primed surface?

If I didnt want to paint, would it be possible (or necessary) to rattle can some self etching primer to the interior for additional priming and a uniform appearance? and perhaps spray the insides of the wings.

cheers