Primer - wait to block?

[Pawned]

I am ready to start painting my 71 Duster. I am reading the data sheets and have a question.

When I was glancing at different pages, I saw that on the Eastwood website, it said WAIT 5 DAYS FOR THE PRIMER TO DRY BEFORE BLOCK SANDING.

That is the only place I have ever seen that. The page was not specific to exactly which primer they are referring to.

I am using the Acme Finish 1 primer. FP410 2K HS primer.
I see now the data sheet says, to sand: 2 hours for air dry, and upon cool down for force dry and short wave infrared.

I have painted the car before and never worked as good as I liked. So this time I am paying close attention the instructions I can find. This time, belt and suspenders

Am I correct that I should block sand by hand rather than a Random Orbit Air Sander.

 

[Bodyperson]

You are comparing apples to oranges. Use the Acme data and yes, hand block if you want it to be straight. 5 days for the eastwood product is probably an epoxy primer.

 

[MoparMike1974]

Find the tech sheet for the EXACT product you are using.

 

[Professor Fate]

Block sanding is just that- hand sanding with a block or board to flatten/true the surface and expose low spots/imperfections. A DA/RO will not do that. Let it dry the specified time, sand and find your imperfections, fix with glaze/high build, reshoot. Repeat until good.

 

[1WildRT]

Depends on the final result your looking for..... When you spray primer the solvents don't fully evaporate in two hours.... Most of it does & you can get adequate results but the truth is the longer you wait the more solvents will evaporate.... While the primer isn't fully cured it will move... If you've seen sand scratch swelling your seeing the effects of solvent trapped while the sanding was done & when released it causes the primer to swell along the scratch lines...

In a production shop they push the work through... Most customers either won' notice sand scratches when they appear a month later or simply won't want to deal with the matter....

If you have time letting the primer fully cure offers a better long term result...

 

[Pawned]

Thanks for the info

 

[Pawned]

So far I have finished the color coat. It has taken almost two weeks to get this far. I now have 7 days to apply the clear to it.
In the past I have applied the primer,color and clear, in one day. Of course, I was never happy with it. Any flaws that may creep up from this painting will remain as long as I have the car. I am very lucky I have even gotten to this point.
I have aged into a lung problem that is fatiguing the hell out of me.
The specialist still has no idea what the problem is. I asked him point blank, if I am creating this in my head and it does not really exist. He told me absolutely not, the lungs are damaged, but no one knows why. Testing starts in about 10 days.
This is the final paint job, but I have gotten better at it every time I did it and I am sure that this will be my best paint job ever. although I can see little thinks that I would have loved to fix.
Last time I finished, my wife told me it looked great and not leave it alone.