Use the following Resin Chart as a guideline to determine resin coverage. Resin to glass usage for polyester and epoxy are very similar.
1 Gallon of Resin Wets Out
|.75oz Mat||64 SF|
|1.50oz Mat||32 SF|
|3.50oz Cloth||150 SF|
|6.00oz Cloth||90 SF|
|10.00oz Cloth||60 SF|
|13.00oz Unidirectional||26 SF|
|1708 Biaxial||27 SF|
|18.00oz Worven Roving||40 SF|
|1808 Biaxial||26 SF|
|24.00oz Worven Roving||32 SF|
|2415 Bi-Ply||16 SF|
(50″ wide material = approx.. 12 square foot per linear yard)
Example for figuring amount of fiberglass needed
Mr. Smith wants to put an epoxy and glass covering of 1 layer of 10 oz cloth and 1101/2102 epoxy. The cabin top is 9 feet wide by 10 feet long (9×10=90 square feet). The total area to be glassed is 90 square feet.
The cabin top width is 108 inches. Using 38 inch wide cloth, Mr. Smith needs three 10 ft. pieces. (108 in . ÷ 38 in. cloth = 2.84 or 3 pieces).
Always consider the width of the cloth plus an overlap allowance at the seams. (We recommend overlapping all seams 1 to 4 inches.)
Since Mr. Smith will be using 90 square feet. (3-10 ft. x 38 in. pieces) of material, he should refer to the resin chart to determine the amount of resin he will need. In this example, Mr. Smith will need one and one half (1-1/2) gallons of resin to cover the cabin top of his boat.