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How do I shoot Gel Coat?

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Applying Gel Coat

Gel coat makes fiberglass reinforced products attractive. Gel Coat is a 2 part surface coating system of pigmented polyester resin (the basic ingredient of gel coat) which "gels" against the mold surface and cures with the structural laminate. Gel coat reproduces the mold surface, imparts color, and protects the reinforcing fibers from external elements. While it is simply a reinforced plastic, surfaces treated with gel coat is often the main part of the structure visible to the eye. Therefore, resins, fillers, pigments and promoters are formulated to develop a high quality surface appearance while its 2 part structure creates a durable and saleable seal.

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Applying Gel Coat

There are 2 major ways of applying gel coat. Because it is a 2 part system. The polyester resin must be mixed with its catalyst which starts the hardening process. You then have approximately 30 minutes before the product sets.

"Hot Pot" System
This is the least expensive way to shoot gel coat. However, you have to finish each batch within approximately 30 minutes. In this system, a measured amount of catalyst is stirred by hand directly into a container (pressure pot) which is then sprayed from a pressure feed tank within the allowable gel time period. This is currently the most accurate system but uses a large quantity of clean-up solvent and unforeseen delays can lead to lost hoses and a difficult cleaning job. This system is therefore recommended for home user, small shops and touch up work. High production shops should use the injection system below since it eliminates the 30 minute curing time and save on cleanup costs. At SGI we have helped solve this issue by introducing Pot Liners which aid in quick cleanup and disposable with minimal waste. In addition we have hose solvent saver system which save 70% or more of your solvents and voc monitoring on cleanup.

Catalyst Injection System (see bottom of page )
High production Gel coat applications today use the catalyst injection system. It permits uninterrupted spraying. The drawback is that this system is more costly. In this system, the liquid catalyst is injected into the atomizing air supply by an adjustable venturi device with a flow meter. The ball settings of the catalyst flow meter are translatable into cubic centimeters or grams per minute so the catalyst feed can be matched to the measured weight output of Gel coat per minute and ratio established. As the output of the gun changes, e.g., change of tip or change of pump pressure, the catalyst delivery rate must also be adjusted to maintain the proper ratio and assure the scheduled performance of the gel coat in gel and cure time.

 

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2001GW

COMPLETE 2 Part System by Binks

2001GW

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hot pot
"Hot Pot System"
GRAVITY FEED
CUP ON TOP

We have some great systems for you. You can use gravity feed spray gun for ease of use and cleanup. They will work on repair and small jobs.

Any gravity feed spray gun with a 2.0 - 3.5 spray nozzle will work. We generally suggest 2.5-3.0 for a good build, however you can use a 2.2 fairly well if you thin your gel coat mixture. We recommend conventional over HVLP due to the difficulty of spraying thick material like gel coat. However, (Reduced Pressure) guns can also be used. HVLP guns may work in lowering overspray and can be used if speed is not as important. Below is some suggestions.

Use our Disposable Cups for easy cleanup!

DPC

dkup


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Any gravity feed spray gun with a 2.0 - 3.5 spray nozzle will work.

We generally suggest 2.5-3.0 for a good build, however you can use a 2.2 -2.3 fairly well if you thin your gel coat mixture. We recommend conventional over HVLP due to the difficulty of spraying thick material like gel coat. However, (Reduced Pressure) guns can also be used. HVLP guns are not recommended for production but for a small job or if you don't mind taking your time, HVLP does work in lowering overspray. Below is some suggestions.

Gel coat guns should be separate from your finishing guns. Gel coat is hard on your spray guns

Conventional Yes, also we carry Binks and DeVilibiss
  Appox - $100
  Best for Low Cost
E70

SGI Top Choice. Great gun for use with Gel Coat. 2.5 Touch up, 3.0 Full Coverage tip sets available.
For the price you cannot find better!

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Industry Standard
J100C
An Industry Standard : USA Made Lifetime Warranty Gel Coat Gun J100C 2.2 Touch up or 2.8 Full Coveragetip set. 2.8 recommended.
Preferred over Binks Gel Gun
  Our Favorite
J100C

SGW Top Recommendation for Hi-End Industrial
Why? Best Modern Technology Lower Overspray Less Material Use, Same Coverage. Reduced Pressure Saves Material 2.5 Touchup or Smaller Full Coverage tip set

Customer: "Please send me what info you have on the units you have in stock. We do boat repair and auto refinishing as well as building boats.

We shot a gel that is thined and a not thined at times.

Later... "Mike, the Gun is great! I need some more cups..."

HVLP
J100C

Great low cost Alternative HVLP gun 2.5mm

Great HVLP gun for spraying Gel!

 
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hot pot
"Hot Pot System"
Step 1 Chose your gun
PRESSURE FEED
CUP ON BOTTOM OR REMOTE OFF THE GUN

A better choice - You can use pressure feed guns with a pressure pot for more capacity. Look at our disposable liners for easy cleanup!!!

 

TP


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Any gravity feed spray gun with a 2.0 - 3.5 spray nozzle will work.

We generally suggest 2.5-3.0 for a good build, however you can use a 2.2 -2.3 fairly well if you thin your gel coat mixture. We recommend conventional over HVLP due to the difficulty of spraying thick material like gel coat. However, (Reduced Pressure) guns can also be used. HVLP guns are not recommended but for a very slow job they may work in lowering overspray. Below is some suggestions.

Gel coat guns should be separate from your finishing guns. Gel coat is hard on your spray guns

Conventional Yes, also we carry Binks and DeVilibiss
  Approx $100 Best Low Cost Units
E70

Our Favorite Setup High End Full Coverage Gel Coat. 3.0 tip set.

For the price you cannot find better!

Gun Only / Complete Outfits

pressuresm

Great Touch Up System 2.5 great size for touch up and smaller full size coverage
2.5 mm Tip Set On the Gun 1 Quart Hi-Pressure Cup

Gun Only / Complete Outfit

Over $100 Industry Standard
J100C

USA Made Lifetime Warranty Gel Coat Gun L100C 2.2 Touch up or 2.8 Full Coverage tip set.

 

  Low CFM - Reduced Pressure Saves Gel!
Our Favorite
J100C
Terrific saves material with new reduced pressure design. Asturo K1 popular due to lower air requirements 7 CFM. A favorite gel coat gun 2.5 Tip Set
HVLP
J100C

THE BEST HVLP AT ANY PRICE FOR GEL K1 HVLP 2.5 tip set

We prefer over Binks Gel Gun

Yes we carry Binks and DeVilibiss

 

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hot pot
Pressure Pots for Pressure Gun
"Hot Pot System"

Step 2 Get your pot

BELOW ARE THE PRESSURE POTS WE RECOMMEND TO YOU

Gel coat guns should be separate from your finishing guns. Gel coat is hard on your spray guns

Use our "Tupperware" like Disposable Liners for easy cleanup!

E70

 

dkup

Best Gel Coat Hot Pot System Period!!!

51-600HP Hi-Pressure Pressure Pot system with full open mouth and RIDGID fully formed disposable cup liners. Purchase in bulk for approx. $2.00 each.

Fully formed liners stand on their own. Solvent proof and have a full open mouth with large lips for no spillage.

 

J100C
2nd choice - Devilbiss 2 Quart KBII System with soft bag liners.
1 Quart
On the Gun - 1 Liter Hi-Pressure Pot for Higher Viscosity Materials
J100C
Less Expensive Pressure Pots

 

 

 
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Continuous 2 part Catalyst Injection System
Small - Medium Facilities
We will help get you set up with over 300 years of combined technical experience.

binks
2001GW


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One of the finest systems on the market by a name you trust - Binks Industrial

J100C

2 Part components are mixed at the gun tip for continuous spray. No premixing and no time restraints. Add any pressure pot above to this system. 2nd catylist may be hooked up to a 2nd pressure line if desired.

more info
GUN ONLY


2001GW

COMPLETE 2 Part System by Binks

2001GW

 

Continuous 2 part Catalyst Injection System
Medium - Large Facilities

binks
2001GW


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One of the finest systems on the market by a name you trust - Binks Industrial

2 Part components are mixed at the gun tip for continuous spray. No premixing and no time restraints. Add any pressure pot above to this system. 2nd catylist may be hooked up to a 2nd pressure if desired. High material Flow. Complies with all HVLP air quality management district regulations. Can be used with flow metered and measured Catalyst tank or precise control or an inexpensive standard pressure pot.

MACH 1 PCX
more info

 

 
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