KO-Seal II, heavy dry spray or over spray

[Imagery]

I just finished spraying sealer (HOK KO-Seal II) on all the separate body pieces for my Porsche 944 project in my temporary garage booth and everything felt rough with over spray. I used HOK medium reducer (75-85 deg) and my actual temperature in the booth was 84 deg so perhaps I should have used the next slower (85-95 deg) but I'm not sure if that would have helped. I used the correct mixture 4:1:1 mixture and a 1.3 needle on the HVLP, 29 psi at the gun and 10 psi at the tip. I had a total of 11 pieces placed all orotund the booth so it was hard to manage over spray direction and the air flow probably is not what it should be because the overspray just hung around longer than I would have liked. I waited a little over an hour to dry and was ready to shoot base coat (BC13.Q01 Meteor Maroon II) but thought that I should lightly tack everything first which didn't really help much. I began with the rocker panels and I could see everywhere that I used the tack rag. I did those and the sun roof and the same thing on the sun roof. I went ahead and did three coats but knew I was going to have to sand it back off but wanted to see what happened. It still showed up underneath where I tacked ( I did not apply pressure on the tack rag, just under its own weight) so I knew I messed up somewhere along the way. Should I sand those pieces down back to the sealer until smooth and then re seal and on the rest of the pieces, sand the sealer until smooth and do another coat of sealer? I just need to figure out what went wrong so it doesn't happen again.

Here is a link to my photo bucket pictures, the first ones are most recent after sealer issue.

http://photobucket.com/albums/ac22/Imagery1567

 

[TAZ]

I don't use the KO sealers. I normally use the KS sealers both KS11 and KS10 (and I also mix these to achieve a gray).
I took a look at your pics. The sealer looks fine in the pics. Looks like you put it on heavy though. I normally over-reduce the sealer and put on 2-3 lighter coats, just in case I do have a problem, I can sand it out fairly quickly. In your case, I think you put it on like primer and put it on so heavy, that it wasn't dry when you tacked it off. It didn't look rough in the pictures. Maybe peely though. That's another reason I put it on light. Just so there is no orange peel. I coat it just enough to be the color of the sealer.

My suggestion is to let it cure (I would think it's cured by now), then either use 1000 or 800 wet and sand it smoother. Then go ahead with your base. You should be able to sand it without going though.

Let us know how it works out.

 

[Imagery]

Well thank you for taking a look and I did what you said and everything worked fine I had to wet sand toe pieces smooth and beat the 24 hour re-seal window before base coat. It took 4 coats to get the coverage over the white but it looks good and the clear laid down fine as well. I used the Kosmic Klear and put on three coats, the last one went on really wet and no runs but that is because the panels were laying flat and not vertical. I decided to not try and do all the pieces at one time so I will just have to break it up into two or three sessions. I just hate having to clean up after each stage but thats ok. I still have a few dust nibs to take care of as expected but I planned to cut and buff anyway. I'll try to post s few pictures of what I have so far.

 

[TAZ]

Glad to hear it worked out for you. Looks like you're doing a great job!!!!
Nice makeshift booth!