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Topic Review (Newest First)
02-09-2013 10:11 AM
Riot Racing I'm starting to think that people are not reading my post in close detail...

So as a report back: I chipped a few of those pimple looks spots ont he surface and I do not see any rust or other contamination under the pimple. This makes me think the problem might be air. I want to talk to the POR15 company and see what they think. Again, im not really worried since it wont show but Id like to learn how to use this product better.
02-08-2013 01:51 PM
mitmaks
Quote:
Originally Posted by Riot Racing View Post
POR15 instructions state to rinse the parts with water after each step of the process i listed
http://www.por15.com/Data%20Sheets/P...cationInfo.pdf

APPLICATION PROCEDURES
Surface preparation: Rusted surfaces are best; seasoned metal and
sandblasted surfaces are also good. Surface must be dry and free of
grease, oil, or other foreign substances.
TO COAT SMOOTH METAL SURFACES: First use Marine Clean to
clean and degrease the surface, when clean rinse with water and allow
area to dry. Second spray Metal Ready on surface full strength, keep wet
for 15-20 minutes then rinse with water and allow to completely dry. Use
of “rust converter” products is not recommended as they may affect
bonding of POR-15 to metal. POR-15 likes to adhere to surfaces with
“tooth” rather than smooth, glossy surfaces.
STIR CONTENTS THOROUGHLY before painting. Do not shake.
Refrigerate unused portion of POR-15 for longer shelf life.

It states to rinse off with water after you apply marine clean or metal ready, did you use any of those products? Simply rinsing blasted metal with water will just flash rust it and will cause problems down the road.
02-08-2013 01:42 PM
mitmaks
Quote:
Originally Posted by Riot Racing View Post
I considered that but kind of doubt this is what caused it. The first pieces I POR15 had this same issue and I only applied 1 coat of POR15 to that surface and the bumps were even worse than these pieces.



I used a wet rag to clean the sandblasted metal. I then used a Tack cloth once the metal was dry to make sure there was no contamination on the metal. I am skeptical that these bumps are lint.
I looked at close up pictures and I can clearly see contamination on metal before POR15 was applied. You should've used some scuff pad/sand paper to knock down whatever is on there (looks like some rough spots in the pictures) and then blow off and tack it real well.
If you had clean blasted metal you should've just used coat of epoxy primer and then a couple coats of high build urethane primer and sand that and it would've been ready for paint.
02-08-2013 07:38 AM
496CHEVY3100
Quote:
Originally Posted by Riot Racing View Post
POR15 instructions state to rinse the parts with water after each step of the process i listed
But not before 1ST coat .i avoid water and use grease and wax remover, you can use it however works for you. just my opinion
02-08-2013 06:27 AM
Alpha67 Looks like trapped air bubbles to me which can happen if you shake the can. It can also happen when applying to heavily with a brush (or depending on brush strokes) according to a comparable product I have used
01-28-2013 09:46 AM
dinger Some look like air pockets, some look like sand particles. Grab an ice pick and start probing. Air pockets may be from a contaminated surface.

Directions on a product are great when they work. These products are going to give simple instructions or most folk are not going to buy the product. Dawn is a good grease cutter. Many paints can't be shaken, they must be stirred. Regardless, until you figure out where you went wrong, this will continue to be a problem. A little sandpaper over the problem areas, a little probing with an ice pick, you should find the problem, then touch up from there.
01-28-2013 09:02 AM
Riot Racing
Quote:
Originally Posted by Lizer View Post
anything should be degreased before painting it. Water is the worst thing you can use; it doesn't lift away or solubilize hydrophobic contaminants, and just results in the freshly blasted metal flash rusting.
POR15 instructions state to rinse the parts with water after each step of the process i listed
01-26-2013 03:24 PM
Lizer anything should be degreased before painting it. Water is the worst thing you can use; it doesn't lift away or solubilize hydrophobic contaminants, and just results in the freshly blasted metal flash rusting.
01-25-2013 07:05 PM
Larry123 Maybe you could chip or cut one of the bumps off and see what's underneath, you might find your answer. Sand, air, rust.
01-25-2013 05:31 PM
496CHEVY3100 Dx330 is just a grease and wax remover,anybodys product would work ,just dont let it dry wipe on wipe off, Play sand does not contain silaca .it us banned in all exept industrial use here,then you must use partical respeatorr not dust mask,,never used alum oxide most people who have used it have no complaints.hope ypu solve your problem ,post when you find iy.
01-24-2013 09:10 AM
Riot Racing
Quote:
Originally Posted by 496CHEVY3100 View Post
You did not mention if you used sand .soda glass ,or walnut shells,on small panel such as the one in picture i have glass in my cabinent with no problems,also coat with por 15 ,i spray mine one coat only . i have seen good results with brush ,if uou used sand with silica it needs to be washed with dx330 ar similar prodect to remove silica ( posion ) when i use sand i use play sand ,non toxic leaves no residue,.possibly wiping with wet ,water ,rag you might be just spreading contaminates, ,there are many opinions ,this is mine after 40 + years.
Company blast the parts. They told me they were going to use Aluminum Oxide for blasting.
I have never heard of cleaning the parts after blasting with anything more than water. I have never heard of dx330.
I thoguht about spray this stuff, but because the metal doesn't show I wasn't too worried it it didn't come out looking good.
I thought "Play" sand has even more silca in it then glass bead?

Quote:
Originally Posted by Gringo View Post
I've been using por15 for years and never seen anything like this. Did you shake the can? You can't do that because you get air bubles in the paint. You have to stir it really well but in a slower motion. I've had really good results and I love the stuff. I should mention that I don't use the prep stuff. I also have never sprayed it. It flows out like glass with a brush. I paint right over rust. Use a lot of paint as in a heavy coat and apply 2 or 3 coats. Recoat when coat is just tacky enough to leave your finger print.
I think i did shake the can a little forgetting that you are not suppose to.
Doesn't the POR15 instruction say to apply in thin coats but apply at least 2-3 coats allowing time for the paint to "tack" in between coats?
01-23-2013 09:13 PM
496CHEVY3100 I also brush the frame works great,but i spray it when it will be top coated with paint,must be covered if exposed to sun , Sun uv rays will work but shortens life. Great product i think.
01-23-2013 08:59 PM
Gringo
por15

I've been using por15 for years and never seen anything like this. Did you shake the can? You can't do that because you get air bubles in the paint. You have to stir it really well but in a slower motion. I've had really good results and I love the stuff. I should mention that I don't use the prep stuff. I also have never sprayed it. It flows out like glass with a brush. I paint right over rust. Use a lot of paint as in a heavy coat and apply 2 or 3 coats. Recoat when coat is just tacky enough to leave your finger print.
01-23-2013 05:21 PM
496CHEVY3100
Quote:
Originally Posted by Riot Racing View Post
I considered that but kind of doubt this is what caused it. The first pieces I POR15 had this same issue and I only applied 1 coat of POR15 to that surface and the bumps were even worse than these pieces.



I used a wet rag to clean the sandblasted metal. I then used a Tack cloth once the metal was dry to make sure there was no contamination on the metal. I am skeptical that these bumps are lint.
You did not mention if you used sand .soda glass ,or walnut shells,on small panel such as the one in picture i have glass in my cabinent with no problems,also coat with por 15 ,i spray mine one coat only . i have seen good results with brush ,if uou used sand with silica it needs to be washed with dx330 ar similar prodect to remove silica ( posion ) when i use sand i use play sand ,non toxic leaves no residue,.possibly wiping with wet ,water ,rag you might be just spreading contaminates, ,there are many opinions ,this is mine after 40 + years.
01-22-2013 09:04 AM
Riot Racing
Quote:
Originally Posted by killeratrod View Post
either not prep right or over worked the por15 and made air pockets. it should be self leveling . just my thoughts
I considered that but kind of doubt this is what caused it. The first pieces I POR15 had this same issue and I only applied 1 coat of POR15 to that surface and the bumps were even worse than these pieces.

Quote:
Originally Posted by mitmaks View Post
Did you run cloth/rag over sandblaster surface? That would result in lint being stuck on rough sandblasted metal. Once you apply coating over it, it would look like little bumps (lint under paint)
I used a wet rag to clean the sandblasted metal. I then used a Tack cloth once the metal was dry to make sure there was no contamination on the metal. I am skeptical that these bumps are lint.
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