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Posted: 10/22/2006 2:48:45 PM EDT
| Ok, it is my first build and first park try, I built a SS tank and tried the home brew and it worked fine on all the mags I did but the ak with the tapco bent flat has problems , the barrel and all other parts are fine but the tapco flat and revets are a lighter gray color, any way to fix this? I would assume the flat and rivets are a softer metal and that is why they are lighter . Is this why all of them get painted , I really like the park look . thanks |
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Most tapco flats are saturated in oil. If you skimped on the degreasing stage this could cause the flat to not take as well. We have had, at the CO build parties, some guys bead blast vs sand blast as a pre-park prep. Those receivers seen to come out more gray (not enough surface area for the park to bite?). All that said, and I know that this will not be of much comfort, with everything done right, some just come out more gray that others. To assure a uniform finish you have to go with a over spray of, molly, dura, or paint. This is my latest one it is a couple shaded lighter and the one before it. 
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Thats how mine looks, I called tapco today and they said I was the first one ever called, yea right!! . I used brake clean then the auto orange degreaser/hot water and then just plain hot water then in the park tank. let me know if you have a tapco flat that came out like the rest of the gun and how you did it . thanks a bunch |
Were these very light but done in mang. solution? If so, I have the same problem to the extent that I threw out my homebrew solution because I thought I messed up. They originally came out dark, but the dark wipes off to leave a light grey in my case. |
I blasted the complete gun, strange everyting came out good but the receiver, with the home brew. it was also in the mag solution . I used two gal dist. water and seven shot cups full of the acid, MSD sheet says it is 40% . also used two and half shot cups of the black mang. powder. all the mags look great also the rest of parts are good , I still think it is the metal tapco used? |
Did you sand blast the weapon prior to parking?   Same procedure, as posted above with sand blasting. |
you're right, I should just shoot it and enjoy. oh wait , I still have to sign the papers on my mortgage, before I can pick up more ammo  When will it end? was at Knob Creek Sat and it was up to 170.00 a case . Thanks guys for the help
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Yours turned out way darker than mine ever did. But I hit mine with gunkote so all is well in the end. |
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The best way to achive the overall black color is to bead blast, then rinse in water(to remove any bead material), then imerse the part in pre-black until the depth of black you want is achived (usually 1 to 3 minutes), then gently rinse with water this removes any loose pre-black solution), do not touch the part after the pre-black has been applied as it will wipe off easily. Then into the phosphate tank for about twenty minutes. The reason for the difference in color is due to metal content. If all the metal you were phosphating was the same, the color would be the same. That is why you had one color for the barrel and another for the receiver. The pre-black mentioned above makes all the parts the same black color and is available from Brownell's as is the phosphate solution. I have used it many times and have enjoyed excellent results. |
OK , how does that work with just wanting to make the receiver darker. would I park the whole barrel and receiver and then blast just the receiver and then darken it and repark the entire thing. the barrel won't get any darker once it is done the first time. thanks for the informative reply hammer and everyone else, I love this hobby 
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There are two (2) methods for finishing. 1. De-grease, blast the part to be phosphated, rinse in water, imerse in the pre-black, rise, imerse in phosphate solution (20 imn.), them imerse in boiling water.. For just the receiver I would remove it from the barrel assembly, de-grease. blast, pre-black, phosphate, then imerse in boiling water. After that I would re-install the barrel assembly being very careful not to damage the finish on the receiver. Below is a shotgun that I did just parts using the pre-black. The gray receiver and barrel assembly were just phosphated (no pre-black).  2. De-grease, blast the entire barreled receiver assembly, rinse in water, imerse the barreled receiver in pre-black, rinse in water, imerse in the phospahte solution (20 min), rinse in boiling water. Do this to each metal part of the rifle (if you wish) so that all parts are the same finish. Below is an Enfield that had most of the finish worn off (the rifling was beautiful), so I used method #2 and pre-blacked the complete rifle. Then added a new stock....it's like you have a new rifle.   As a warning, phosphate may weaken springs and cause them to break if phosphated. I routinely remove all springs prior to blasting and phosphating. The big problem is the AK's mag catch spring. I haven't phosphated an AK mag catch spring to see if this is true. Others have accomplished phosphating without any problems to the spring. I just added this to let you know that it can happen (it came with the phosphate instuctions I use from a long time ago). |
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I just looked on the Brownell's website and the price is $50.00...WOW!!! When I bought mine it was only $15-$20, but then it was a smaller bottle. I bet that quart bottle will make many gallons of pre-black solution. I guess I'll have to pay that price once my bottles are empty. It is expensive but the results I've gotten are well worth it if your looking for a nice even black color. As Brownell's says, you use it with "ZINC" phosphate (not manganese). I don't know what would happen if you used it with the manganese phosphate. |
have you been using zinc, I have only used maganese type. |
| Yes, I use the "zinc" (the solution is a greenish color). It gives a nice gray color if you don't use the pre-black. The manganese will give a darker gray, sometimes almost a charcoal gray, but different metals will be different colors of that charcoal gray. That's why I started using the pre-black with zinc, I didn't like the different shades of charcoal when using the manganese. |
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