How To Apply
Epoxy Bow Finishing Tips
Using Thunderbird Epoxy 'Endurance Bow Finish'

Thunderbird Epoxy is a two-part finish that must be mixed, allowed to stand, then thinned prior to use.

The components are marked ‘Part A’ and ‘Part B’.. Combine equal parts of Parts A and B by volume (such as two ounces each). Mix, and wait a minimum of one half hour to allow the chemical curing action to start and activate the mixture (a process called induction). After induction, thin the mixture approximately 25 to 30% by volume.

[For example: 25% of the combined volume ( 2 oz. A plus 2 oz. B =4 oz) would require one (1) ounce of Thunderbird Epoxy Thinner] IMPORTANT: You MUST let the mixture of parts A and B stand for 30 minutes minimum BEFORE you add the Thinner.


Before spraying the finish coats, properly prepare the surface of the bow so it is ready to accept the finish. This preparation is no different than using most other finishes, and should consist of adequately sanding the entire bow and wiping it clean from dust and fingerprints with denatured alcohol or acetone.

Do NOT use lacquer thinner, mineral spirits, paint thinner or any other product except denatured alcohol or acetone to clean the bow.


Start the finish process by filling the wood in the handle section, edges, and tip overlays, if open grained hard woods are used. We have a high solids vinyl filler and sealer for sale that works with our epoxy. However, the epoxy itself also makes an excellent sealer. Either product fills the grain and provides a barrier to the oil in the rosewood, cocobolo, and other similar hardwood families. There are two ways to apply the sealer (or the finish as its own sealer): (1) Spray or brush on two heavy coats, about 3 hours apart, and allow to dry at least twelve hours.


Sand this prep coat down smooth with #220 grit sandpaper. Repeat this process, if more is needed to fill any remaining grain. Usually two coats of sealer are sufficient. (2) The second way is to mix a small amount of epoxy as directed and brush or rub this into the wood with your fingers or a cloth dipped in the mix. Wait a few minutes for the solution to fill the grain; add a little more, wait, etc, until the grain is filled. After the grain is filled, let the wood dry at least three hours. When it's dry enough to sand out, then sand the riser section smooth, and begin the final finish process. At this point only use denatured alcohol to wipe finger prints or dust so as not to dissolve the finish which is not totally cured.


Actual application is like most other finishes. The epoxy goes on evenly and lies down nicely. Depending on temperature and humidity conditions, it will be touchable in one to two hours, and recoatable in three. In preparing the bow before spraying, sand with #220 grit sandpaper, and wipe down with a solvent to remove fingerprints and dust. You need not sand between coats, but if you do, then allow more time, up to 12 hours, between coats. We recommend three coats of finish to provide lasting protection for a bow. You can achieve a hand-rubbed, extra smooth finish by sanding the bow after two days, with #400/600 wet sandpaper, and then buffing with #0000 steel wool. For cleanup and spray gun cleaning, use Thunderbird Epoxy Thinner, lacquer thinner, acetone, or a mix of the two.


Extra tips:
For a smooth Gloss finish use a prayer with a .08 to 1.0 Valve. Satin and flat can be sprayed with up to a 1.4 valve in your HVLP sprayer Technical Info

Be sure that all flattening agent in the Satin and Flat is mixed though and that none has settled in the bottom of can. We suggest store the can upside down so when done shaking none is left on the lid.

Spray 3 or 4 light coats about 5 minutes apart to achieve on good coat. This give a more even and smoother finish

We also sell:

Pen Kit: The black or white ink will not fade or run with this finish. Dropper the ink into the "reservoir" on the underside of the pen tip. Write smoothly; clean up using plain water before ink dries waterproof.


THUNDERBIRD EPOXY
TECHNICAL DATA

Hardness (Sward-Rocker)....................................... 65
Impact Resistance (22 gauge steel)..........................173 inch-lbs.
Flexibility (1/2" mandrel)
a) at -60 degrees F. .......................................cracks
b) at room temperature....................................passes
c) at +180 degrees F. ....................................passes
Tabor Abrasion (gms. wt. loss after 1000 cycles) ...0.035
Color (clear mixes, Hellige Comparator) ..................4.5
Chalking (300 hrs. in weatherometer) ......heavy (surface only: removable)


Weathering and Waterproofing... Virtually a complete moisture vapor barrier. Surface exhibits moderate chalking after extensive exposure to ultraviolet (sun) light. Four years exposure shows that chalking, on surface only, may be easily removed by washing or wiping with the underlying coating still having good gloss without a film breakdown. The good film integrity indicates continued protection.


Corrosion Resistance ... Both vehicle and pigment contribute to the high degree of resistance to corrosion.

Gloss (Initial) ................................................................. 100
a) after 300 hrs. in weatherometer ............................... 75
b) after 600 hrs. in weatherometer ............................... 30
c) washing after 600 hrs in weatherometer ................... 90


Heat and Cold Resistance
Passes 25 cycle heat and cold test.
(-65 degrees to +200 degrees F.)


HEAT RESISTANCE
24 hrs. at 200 degrees F. ............................... No discoloration
8 hrs. at 250 degrees F. ............................... No discoloration

96 hrs. at 250 degrees F. ........................... Slight discoloration
8 hrs. at 275 degrees F. ........................... Slight discoloration

24 hrs. at 275 degrees F. ..................... Moderate discoloration
8 hrs. at 350 degrees F. ..................... Moderate discoloration

24 hrs. at 350 degrees F. ......................... Severe discoloration
8 hrs. at 400 degrees F. ........................ Severe discoloration


Temperatures to 500 degrees F. caused film to turn yellow and with continued exposures to brown, then black. There was no carbonization and no effect to gloss. Adhesion, chemical resistance and electrical properties are retained. At temperatures above 600 degrees F. film carbonized. It is important to note that the effect to heat in multiple exposures is cumulative. Therefore many short exposures to heat will have a similar effect to one long exposure.


Moisture Vapor Transmission Rate (0.025 gms./24 hrs.: 1.5 mil coating thickness - Payne Cup).
a) Theoretical - on 2 mil thickness or 0.0508 mm., 4.05 mg. of
moisture permeates through 100 square inches at 100 degrees
F. in 24 hours.


b) Actual Test - (24 hrs. at 100 degrees F.) 49 mg. loss
.0685 mm. coating thickness 10 square centimeter area.
On the basis of grams per 100 square inches the rate of
moisture vapor transmission is 3.16 grams per 24 hours at
100 degrees F.


Heat Reflectivity ......................................................... 81-83
Light Reflectivity (average)
a) white #200 - gloss................................................. 75%
b) white #200 - satin.................................................. 82%
c) white #200 - flat.................................................... 88%

Flash Point (Tag closed cup)...varies with formula 40-100 degrees F.

PHYSICAL PROPERTIES: 3 Mil wet coat applied at 75 degrees F.
Percent Solids: 36.0 +2.
Pot Life: 12 hours +.
Dry Time: Dust free, 30 minutes;
Dry to handle, 4 hours;
Hard, 8 hours;
Full cure, 7 days.
Heat curing time: Air dry for five minutes at room temp.
1 hour, 130 degrees F.;
30 minutes, 150 degrees F.;
20 minutes, 180 degrees F.;
10 minutes, 250 degrees F.


THUNDERBIRD EPOXY
CHEMICAL RESISTANCE

Film thickness 4-6 mils normal 3 coat application. Coatings post cured at 200 degrees F. for 30 minutes. Coatings cured 7 days at room temperature provide slightly less resistance to chemicals and solvents.

KEY: NC - No change; SS - Slightly softened;

S - Softened; F - Failed; E - Excellent.

DAYS IMMERSED
ACIDS 30 60
Acetic 5%
Acetic 50%
Acetal Glacial
Citric 10%
Citric 50%
Fatty Acid (Linseed)
Hydrochloric 10,20 & 30 %
Hydrochloic Vapor
Lactic (Dairy Products)
Nitric 10%
Nitric 20%
Nitric 30%
Phosphoric 85%
Sulphuric 25%
Sulphuric 50%
Sulphuric 70% Sulphuric 80%

ALKALIES
Ammonium Hydroxide 25%
Ammonia Vapor
Sodium Hydroxide
(all concentrations)

SOLVENTS
Acetone
Allyl Chloride
Butyl Alcohol
Carbon Tetrachloride
Diethylene Triamine
Ethyl Alcohol
Ethylene Diamine
Formaldehyde 30%
Methyl Ethyl Ketone
Isopropyl Alcohol
Methyl Isobutyl Carbinol
Methyl Isobutyl Ketone
Mineral Spirits
Toluene
Xylene

DETERGENTS AND SALTS
Detergents, Anionic 2%
Calcium Hypochlorite 5%
Sodium Chlorite 25%
Sodium Hypochlorite 5%

WATER
Fresh
Chlorinated
Salt - Water or Spray

STAIN RESISTANCE
Butter
Citrus Juices
Coffee
Cola
Crayon
Gasoline
Grease
Hair Tonic
Ink
Lard
Lipstick
Liquor
Milk
Mineral Oil
Mustard
Vinegar