DICROPAN T-4® Reviews & Ratings

DICROPAN T-4 ROUCH-UP LIQUID GUN BLUE

T-4 is in the catalog because of customer demand. As Maynard Buehler said: "THIS is the BEST yet." Every time a new gun blue comes on the market, we test it on a piece of gun barrel. We blue three spots: one with the new blue, one with Oxpho- Blue™ and one with T-4. One day later we start rubbing all three areas with steel wool until one of them starts wearing off. So far, Oxpho Blue™ is toughest and T-4 next. However, for ease of application and deep density of color, T-4 is superior. Its ability to touch-up wear areas and scratches instantly has made it a favorite.

SPECIFICATIONS:

Available in 4 oz and 32 oz. Bottles
Instanlty Touch-Up
Must Ship Ground

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Reviews Summary

DICROPAN T-4® consistently impresses users as a reliable cold bluing product, particularly for touch-ups and repairs on older weapons. Reviewers appreciate its ease of use, effective results, and excellent shelf life. Some users noted it outperforms other brands, offering a deep black finish that blends well. Though initially hesitant, many have found it to be a worthy alternative.

What Reviewers Are Saying

Product Effectiveness

83%

Many users praise the effectiveness of DICROPAN T-4®, specifically its ability to provide a smooth, dark black finish that works well on various metal types. It is particularly noted for blending scratches and dings seamlessly, making it ideal for both restoration projects and routine touch-ups.

Usability and Application

67%

Reviewers highlight the ease of use of the product, emphasizing the importance of proper preparation for optimal results. Users appreciate that applying DICROPAN T-4® doesn't require extensive tools or expertise, making it accessible for both novices and seasoned restorers.

Cost-Effectiveness

50%

Several reviews mention DICROPAN T-4® being less expensive while providing results comparable or superior to other brands, such as Brownells 44/40. This aspect makes it appealing to users who prioritize quality without breaking the bank.

Shelf Life

33%

Reviewers appreciate the long shelf life of DICROPAN T-4®, noting that a small quantity lasts for numerous applications. This makes it a practical choice for those who only need to use it occasionally, reducing waste and cost over time.

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Excellent!!

I needed something for re-blacking part of a Glock slide. This did the trick.

by CRAIG EVANS on April 03, 2026

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great product

I have been using this for years restoring older weapons and touch up. prices change but this really works!

by PATRICK CASH on June 13, 2025

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Great Results!

For years, I have been a big fan of Brownells 44/40 and have used it as the standard for testing other cold bluing products. I had also previously used the "creme" version of Dicropan T-4 and did not particularly like it. However, I now have to say after doing fairly extensive (non-scientific) testing of the Dicropan T-4 Liquid that I am replacing my 44/40 with it. It not only works as well or better than any other I have tried, but it is also less expensive!

Great alternative to cold blueing

This is a great product for touch ups and blending in dings or scratches. Like the directions say, prep is crucial. Clean/degrease area, then dry. Wipe/blot on (a saturated Q tip works great) let sit for a few seconds. Then wipe off with same bore cleaner/degreaser. Then I found you can rub in a little oil to seal in the color. Not so much for complete bluing, but deffinetly great for touch ups and blending any scratches. This sets as a really nice 'dark black' color when done. Works with carbon steel only. Hope that info helps.

easy

I only need a drop or two occasionally and shelf life is excellent.

Dicropan T-4

Have a Ruger P95 with the plum colored slide. Regular cold blueing products would not work,but Dicropan T-4 gave it an even and deep black color. Looks brand new.

the best !!

Fantastic product for touching up my WW1/WW2 collection !!!