• Fast wet out
  • Cures without surface tack
  • Waxe
  • Cures at room temperature with the addition of MEKP catalyst
  • No sagging on vertical surfaces
  • Thixotropic
  • Ships within one business day


100% MONEY


Sku: 050220020115

Fiberglass Warehouse Ortho Polyester resin is a general purpose orthophthalic (ortho) polyester finishing resin. It cures without a surface tack.  Pre-promoted for curing at room temperature with the addition of methyl ethyl ketone peroxide (MEKP) initiator. Fiberglass Warehouse Ortho Polyester resin has a clear amber tint to it.


-Boat construction and repair

-Molding, fabrication and repair of fiberglass laminates

-Spray up process

-Hand lay-up application

-Base resin for polyester fairing putties and structural compounds


-Work area and resin should be between 70°F and 75°F for best results.

-Make sure the work area is well ventilated and wear proper safety clothing including gloves and a face mask.

-MEKP catalyst is needed for polyester resin to cure.  It should be added between 1-2% based on the volume of the resin. More or less than this will cause an improper cure.  Cure time and pot life will vary depending on percentage of MEKP added and the temperature of the room.  If 1% MEKP is added, there will be a longer pot life and it will cure slower than if 1.5% or 2% MEKP is added.  Same goes for temperature.  Lower temperatures result in a slower pot life/cure time than if working in higher temperatures.  Orca 200 is promoted to gel in 17-23 minutes at 77°F when catalyzed at 1 percent (approx. 1 tsp per pint).

-Apply using a fiberglass roller, brush, spreader or squeegee

-No need for sanding between layers

-For the final layer, a finishing resin can be used to create a hard, tack-free surface. Finishing resin contains wax which rises to the top when cured and seals off the air.

-Uncured polyester resin can be removed from tools and equipment with acetone.

Available Sizes:

Quart, Gallon, 5 Gallon

Drums are available. Please call for pricing.

Handling and Storage:

Closed containers should be stored in a cool, dry place.  It should be stored at temperatures below 75°F and away from sunlight and heat sources. 

Orca 200 is guaranteed for 3 months but should last 6-12 months if stored properly.

Prop65 Warning Icon WARNING: This product can expose you to chemicals including Styrene which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov

Customer Reviews

Based on 9 reviews
Great for layup

I used this for a transom rebuild. Easy to use and cures quickly with the correct amount of MEKP.

Dennis J. La Frinere
Pretty good product

I'm a fiberglass Tech. Have been for 22 plus years and this resin works very well. Be patient. Don't buy the Home Depot junk and it's more expensive than this resin. Wait for the shipping and buy this resin it is well worth it

Works great

Works great

Amazon Customer
Works great

Very easy to use Great product

henry short
Great product and darn good price.

I works great i build dinghys and do a lot of boat repairs and this is my number one choice 😀


Question: Do I need to sand between layers?

Answer: No. This resin does not contain wax which makes it unnecessary to sand between layers.

Question: What do I do to get a tack free finish on the final layer?

Answer:You can add wax/ surface seal for the final layer or use a polyester finishing resin.