Our Liquid Urethane Foam is a two-component Isocyanate/Polyol base, with a pour-in-place system. The urethane apparatus is available in 3 separate density formulations by weight per cubic foot, which is displayed below:
- 2 quarts of 2 lb. foam will cover 2 cubic ft.
- 2 quarts of 4 lb. foam will cover 1 cubic ft.
- 2 quarts of 8 lb. foam will cover 1/2 cubic ft.
*Note: The 2 lb. foam expands the most whereas the 4 lb. & 8 lb. foam expands less.
One can discover the different categories for the use of liquid urethane foam:
- Marine floatation
- Mold Making
- Decorative and Architecture
- Millwork Pieces
When working with the foam, you will find: it’s resistance to mildew, mold, and solvent. The product also has impeccable durability attributable to it’s fantastic comprehensive strength. WOW! There is certainly a plethora of different purposes for Liquid Urethane Foam, and in addition to that; FGCI receives a number of questions concerning whether or not resin can be applied on top of the foam… We would like to mention that certain types of foam possess different temperature variations which can affect the application process, thus the system must be mixed correctly. If one were to mix in an excess amount of activator, the foam will become soft and spongy. For more information on how to apply resin to foam, click here: Can I Apply Resin to Foam
Directions for General Small Quantity Use:
Step 1: Mix equal parts Base and Activator (1:1 by volume) or mix by weight (approx. 112 parts A-Side: Base to approx. 100 parts of B-Side: Activator).
Step 2: Mixing and metering equipment must accommodate the 1:1 by volume mix ratio.
Step 3: Mix thoroughly using a stir stick or a mechanical mixer. Please refer to Typical Reaction Profiles of Liquid Foam Chart for mix times.
Step 4: Pour immediately after mixing.
Step 5: Allow cooling between pouring.
*Directions may vary by application. For technical support and assistance with critical applications or large pours, please feel free to contact Customer Service at 1-800-272-7890.
When a project calls for sanding, one must confirm the correct materials are being used. Reason being is due to the different sizing, backing and grit of the sandpaper. But, how can we identify what type of sandpaper is best? Subjected to the work needed for your project, grit size will come into play. Thus, we must make note that sandpaper is measured by its grit size while others are measured by both the grit and grade of the backing. When buying your sandpaper, check the item to confirm it states the pressure sensitive adhesive (PSA) or the grit and size number. This will help when deciding which one is best for the project at hand.
Sandpaper Grit Sizing: If you are looking to remove a previous material such as gelcoat; begin sanding your surface with a 150 grit or lower. A low grit number determines the coarseness of the sandpaper which will give you the ability to remove materials and coatings. Sandpaper with a grit number in the 200’s and higher would be great for finishes such as buffing, polishing or the removal of small scratches. A high grit number is equivalent to how small the grains are which will allow you to smooth the surface.
Sandpaper Weight Grade: One may see grade letters ranging from A-E which represents the durability of the sandpaper, where E is the strongest. For example, (based on the figure above) the red Mirka Royal 40 grit disc would be ranked as the most durable, next the Mirka Bulldog 120 grit Gold, followed by the gray Mirka Bulldog 400 grit Gold .
Here is a great tip!
If you are looking to conduct a wet or dry sanding, the sandpaper coating must be waterproof. An abrasive that is waterproof will last you longer with end results you’re aiming for in a wet/dry process.
At Fiberglass Coatings, we have all the tools, materials and knowledge to help you with your job, whether it being a large commercial job, or just doing a project around the house. With that in mind, we are spotlighting a product we have had around for a long time, but not everyone knows about; Duratec High Gloss Additive.
This gelcoat additive is useful for several different reasons. The first, when adding this as a 50/50 mixture will not only produce a high-gloss, paint-like finish, but it will also thin the gelcoat without adding a yellow tint, like Styrene can do. This is why we recommend this product for thinning while spraying. In the process of adding this additive, you will not need to add Sanding Aid, as this would be the final coat. The only difference is that you will want to wait a full 24 hours before buffing to ensure the gelcoat has fully cured. In order to get a hi-gloss finish, 600 grit paper or higher, will be needed to sand, then buff with Aqua Buff 2000 Compound.
Another benefit of this product is eliminating porosity in tooling gelcoat. When you add this product as a 25% mixture, not only will it add an extra gloss to your tooling gelcoat, it will eliminate the porous surface by over 20 percent, allowing the surface to be waxed easier, and your part to pulled with less effort.
Check out the Tech Data Sheet HERE.
If you have any questions, be sure to contact us and we will be happy to help!
One of our top products is a filling/fairing putty called OEM Super Poly-Fill. It’s now being sold through Amazon.com and Ebay.com so we wanted to take a moment and give you some tips from the pros on how to make sure your project benefits from this product.
- It uses MEK-P just like Polyester Resin does, so you want to refer to the catalyst chart for mixing ratios:
- Do your surface prep! Make sure you clean the surface, remove any paint or rust and rough the surface with some sandpaper to get the best adhesion.
- The product working time is 12-18 minutes, IF catalyzed at 1% and if it’s the magic temperature of 77 degrees in your working area. If it’s hotter out, and we all know it will be, our pros recommend cooling the product down before use to extend the working time.
- If you are using it to fill holes, always fill a little high and plan for a slight amount of shrinkage. Once it dries, you can easily smooth it out with a little sandpaper.
Check out a little more about the product from our time on Ship-Shape TV, with its Host, John Greviskis and our own VP, Jeff. They give a few more tips on how to get your project to look professional.