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Make Your Own Printed Circuit Boards
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Looking for those hard to find PC Boards? We have them cheaper than you can find elsewhere. If you see it cheaper, PLEASE give us a chance to beat that price for you. We have the widest variety of boards in the industry. If you don't see it, just ask. We have boards from .005" thick to double sided boards with 4 oz. of copper on each side.

Buy Your Photo Resist HERE !!





Problem: The unwanted resist washes off in the developer with the artwork.

Solution: The artwork is too porous.  When you hold your artwork up to the light, you should not be able to see through the dark sections.  To correct this, you can try “doubling up” your artwork (have two pieces of artwork 1 on top of each other).

It has been our experience that the best way to print the design is to have the pattern right on the board without even the thickness of the Mylar to cause a possible undercutting of the design. Most important, however, is that the lines and lands be 100% opaque. We recommend using an exposure guide, like our PC50A, so you can see what the density of the artwork must be. As long as the design is lightproof and the artwork has an airtight contact onto the board, then your chances of undercutting will be greatly reduced.

Exposure Problems

Problem: When making double-sided boards, had to remove background with water. When making single-sided boards, background didn’t move at all.

Solution: Deteriorating situation and must check light source.  Whenever the background turns a dark color and is visible and the background remains dark, the problem is probably the UV exposure.  The fact that it turned dark is because the Photo resist was only partially activated and not fully activated.

Problem:  Background only turns a light color even though the exposure and distance and fixture were correct.  The board did not etch when placed in the etching solution.

Solution:  When setting up the fixture, the plastic protective shield that comes with the fixture was not removed.  This shield must be removed to expose boards because it blocks the ultraviolet light and the resist is not properly activated.

Problem:  Used 15-watt blb bulbs.

Solution: The blue in the blb bulb blocks the ultraviolet so that you’ll get partial exposure because the resist is only partially activated.  It is important that the bulb is a bl so that the 350-nanometer range is hit and the board will be properly exposed.

Applying Photo Resist Yourself

Question: Can I apply Photo Resist myself?


We found that the best way to coat a board is using sophisticated dip coating machinery that coats the entire board evenly.  By withdrawing the board from the resist at a precise rate, we achieve a coating with a variation of  .00004 inches over an 18 x 18" board.  You cannot achieve results like these by hand, which is why we recommend to people to buy our precoated boards.  ANY other method you use such as spin coating, air brushing, using an air sprayer, or applying using a silk screening process is going to have approximately the same effect so you can use your method of choice.
We dry our boards through a carousel oven with heating plates on both sides of the board at a rate of 500 degrees F, then let the board air dry for 2 days.
The MSDS for this product is in our MSDS section on our website called PC 197 Positive Photo Resist.
We no longer manufacture this product in a spray can because the eradication of CFC's in the late 1990's, which was our propellant for this product, left us with the choice of manufacturing a spray can with less than 1 oz. of photo resist in it, or making a product that has a high chance of exploding.  Neither choice is acceptable to us.
I am sorry if it sounds like it is difficult to apply this product yourself, but, quite frankly, it is.  We have spent many years and invested quite a deal of money in machinery to apply this resist to boards.  Although we sell the resist to people who want it, we recommend that you buy our precoated boards or have us coat your material for you if at all possible.  If the quality and preciseness of your coating is important to you, you cannot achieve the results we achieve by hand.

Answering Service

Question: I called the 24 hour toll-free number and spoke with a representative who was unable to answer my technical questions or take my order.  Why have a 24 hour customer service number if you can't serve the customer at all hours?

Answer: We are sorry that you had to speak with our answering service about a technical matter. They are only message takers that are on call 24/7. This is so that you could have the chance to speak to a real person instead of leaving a message on a non-feeling answering machine. We know that the best alternative to speaking directly to us would be to have a some sort of expert to field your questions 24/7. That is why we felt it would be better to at least have a "live" person to talk to.

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Contact Information





Postal address

40 Diamond Drive, Plainview NY 11803



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General Information: injectorall@mindspring.com

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