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Old 04-16-2005, 03:32 PM
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Dalmation effect in primer

I just shot some fill primer (Nason Ful-Fil acrylic #421-09) over the epoxy primer (Nason Ful Poxy 483-19) I shot yesterday with a second coat this morning. In the sections of the body where I had experimented with a resin soaked synthetic material to get some rapid build up (the areas over the rear quarter curve and around the cockpit) I got a blotchy Dalmatian sort of effect as the red primer dried. This ONLY occurred in those areas where I had used resin and then regular body filler to smooth out the lines. In the areas where I only used body filler (around the cowl curves) I did not get this effect. Could this be something bleeding up through from the resin? There is no "dimension" to the blotch (it is not lifting or bubbling), just a discoloration. I shot this at about 65 degrees. There was no rain when I started but by the end of the shoot it was sprinkling a bit outside (if that might have an effect). I also shot it about 3 hours after I had shot the second coat of epoxy.

I still have a lot of sanding and straightening to do with the long board so I'll be working these areas pretty heavily. But I'm wondering what may have caused this, if I should be concerned, and if I should shoot a sealer over the primer (or take other measures) when I'm all finished with the hand work. I intend to shoot a flat black enamel over the top when I'm done.



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Old 04-16-2005, 03:39 PM
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Could be just a slight differance in surface, which results in the more porous surface absorbing differently I will be interested to see what Barry has to say about it.

Vince
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Old 04-16-2005, 05:04 PM
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From the picture looks like it just may be soaking in in spots.

Now, very important if any of those spots dried with a shinny look
like it had oil or silicone applied to the spot, than you have a major problem.
The pictures does not show that, but pictures can fool you.
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Old 04-16-2005, 09:21 PM
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Quote:
Originally Posted by BarryK
ow, very important if any of those spots dried with a shinny look
like it had oil or silicone applied to the spot, than you have a major problem.
No, the spots are dull, almost like I splashed on some thinned gray primer. Something I didn't mention in my initial post is that the spots appeared after shooting 2 wet coats of the red primer and then one final coat of very thin (probably about 1:3 or 1:4) which is something I have done in the past to smooth out the "dust" on the the surface of the wet coats. Don't know if too much lacquer thinner could be the culprit or not. I guess the most logical thing to do is just shoot another heavy wet coat on those areas and see what happens.
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Old 04-18-2005, 05:46 AM
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The best thing you could do would be to ditch that laquer primer, makes for a good guide coat though. Use a urethane primer. Over reducing that laquer primer is asking for even more trouble since the primer will absorb major amounts of the thinner from the over reduced coats you've applied. The primer then has to release this solvent which can take a very long time. Blowing over reduced product on fiberglass is asking for even more problems- the fiberglass will also act like a sponge. If you need major buildup then polyester primer is the only way to fly IMO. Bob
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Old 04-18-2005, 08:05 AM
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Additional information supplied by your response indicates what the problem is. Baddbob has some good tips for you.

Vince
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Old 04-18-2005, 04:41 PM
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Quote:
Originally Posted by 302/Z28
Additional information supplied by your response indicates what the problem is.
Vince,

You mean shooting that a final coat with too much thinner?
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Old 04-18-2005, 07:51 PM
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Not Vince but yes.
Lacquer primer is so outdated now and only diehards and (no offense cboy) old guy's who don't know better use the stuff.
Your shooting almost straight solvent on top of everything and anything that's porous will soak it up and it will be AWHILE releasing it.
The spots your seeing is where the thinner has "cut"(soaked) into the repairs.

Not that LP is a bad thing,It's just that there are MUCH better products out and life is SO much better using them.
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