1. Can I add more hardener to epoxy to make it cure faster?
On Page 3 of Product Bulletin Premium Marine Grade Epoxy. the section on Mixing will answer this question. It is important that only the recommended mixing ratio be used, too much or too little hardener will produce inferior results. Never thin epoxy with solvents. Be sure to mix thoroughly, as incomplete mixing will produce an incomplete cure. Mix vigorously for two (2) minutes.
2. Can I add more catalyst to polyester make it cure faster?
Catalyst ratio can be varied to speed up or slow down the cure. Do NOT use less than 1% or more than 2% catalyst to the resin.
3. How can I thin polyester resin? Epoxy?
Use no more than a ratio of 10% by volume of the Styrene Monomer for thinning, as higher concentrations will degrade the resin's properties. Do NOT use with epoxy.
4. How much area will this resin cover?
The coverage area for resin can vary dramatically depending on the particular application and the application technique. Here is a general "rule of thumb" for resin coverage: (per gallon)
Cloth: 40 sq. ft.
Mat: 20 sq. ft.
Roving: 15 sq. ft.
No Fabric: 100 sq. ft.
Cloth: 40 sq. ft.
Mat: 20 sq. ft.
Roving: 15 sq. ft.
No Fabric: 100 sq. ft.
5. Which resin should I use...epoxy or polyester?
There are many resources within this site to help you make a choice. In particular please explore the Product Information section for numerous relevant pdfs. Here are a few advantages and disadvantages of each:
Polyester Advantages:
• Lower cost
• Cure time can be controlled by catalyst ration
• No sanding between layers
• UV resistant (Surfboard resin)
Polyester Disadvantages:
• Odor and flammability
• Need to establish surface core
Epoxy Advantages:
• Better adhesion
• Better chemical resistance overall
• Low or no odor
Epoxy Disadvantages:
• Requires accurate mix ratios
• More expensive
• If cured, requires sanding between layers.
Polyester Advantages:
• Lower cost
• Cure time can be controlled by catalyst ration
• No sanding between layers
• UV resistant (Surfboard resin)
Polyester Disadvantages:
• Odor and flammability
• Need to establish surface core
Epoxy Advantages:
• Better adhesion
• Better chemical resistance overall
• Low or no odor
Epoxy Disadvantages:
• Requires accurate mix ratios
• More expensive
• If cured, requires sanding between layers.
6. Does TAP have a penetrating epoxy?
Read Product Bulletin Premium Marine Grade Epoxy. The 143 B-Side Hardener (Slow) excels in penetration. It contains no solvents.
7. Can I spray Finish Coat Polyester Resin?
Permanent damage can result if a resin system is used in any kind of a paint sprayer. However, TAP sells the perfect answer, a GelCoat and Resin Spray Cup Gun.
8. What is the gel-time and working-time of polyester or epoxy resins?
Gel time (also called 'pot life') of resins depends on the resin, the volume, and the temperature. Higher volumes and higher temperatures accelerate the cure, shorten your working time. For typical gel times see our comparison chart.
9. Which mold release will I need?
TAP carries a variety of mold releases. Please check each of the related products listed below for more information.
10. How do I clean gel coat?
For a mildly dirty surface, use soap and water follwed by wa. For faded, oxidized gel coat, use either 3M Marine Fiberglass Restorer or Island Girl.
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