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Yesterday I painted an item with Rustolium rattle can semi gloss paint. Today I thought I'll spray on another coat. I came back a half hour later and both coats had honeycombed and fish eyed. What gives? Did I not allow yesterdays coat to dry sufficiently ? This is not the first time I have experienced this.
Jerry

I experienced something similar once and it was caused by wiping the part down with lacquer thinner prior to painting, I use acetone now and it hasn't happened since.

I did not wipe down this item with laquer thinner, acetone or any other product prior to paint or between coats.
Jerry

I've used a lot of Rustoleum for many things and never had that problem. My opinion is the part wasn't "clean" enough as sstock suggest. Let us know what you find out.

I've rushed it also Jerry and had problems.
Read the small print: Apply second coat within 1 hour or after 48 hours.


DG

Fisheye: That means the metal/paint/primer underneath the new coat of Rustoleum was contaminated. Usually the result of someone using Armor All, WD-40 or equivalent in the past.

Also, I think there is a window of time for recoating fresh Rustoleum. But 30 minutes should not have been an issue. The metal was not cleaned/de-contaminated properly. I find I usually have paint issues if the metal is not media blasted clean.

The coat from the day before didn't have enough time to cure
Dave, re-read the part about only waiting over night, it took
a half hour for the new coat to blister the whole shebang up.
If he didn't have problems with the first coat he sprayed last
night then he doesn't have a contamination problem.

DG

Dang it, misread another post. Yes, the problem is from recoating after overnight dry of first coat. If I have to do recoating, I wait a week…same for adding catalyzed clear.

I don't know why, but anymore on the spray cans it says to topcoat within 30 minutes or wait 72 hours before top coating....

John

My understanding it has to do with the type and quality of the reducers (the part of the paint that evaporates) they use. Sort of like the difference between Lacquer thinner, paint thinner, gasoline, and kerosene. Set an ounce of each out in an open container (all the same size) and see which one is gone first.

Set the same solvent from 4 different suppliers out in the same test and you'll find they act different from each other as well.

Slower (and less pure) solvents that are not fully evaporated and 'cured' in the first coat reactivate and lift the pigment when the second coat is applied to soon. If applied within the first window the two coats melt into each other.

OK, Problem solved. Took the item down to bare metal, sprayed first coat , then respray half hour later, let cure 2 days and installed it. It looks good.
Thanks guys for the info.
Jerry