Black Bear Thin Epoxy Resin

Black Bear Thin Epoxy Resin is a low weight molecular epoxy resin. It is formulated to cure at room temperatures using Black Bear Hardeners The mix ratio of Black Bear Epoxy is 2 part resin to 1 part Hardener

When mixed with standard industry fillers it can be used as a fairing and filling compound Black Bear Thin Resin and Hardener mix can be used for coating sealing, barrier coating, laminating and bonding.

Please note: this is the resin we recommend when doing cloth work as it wicks out into the cloth saving time and effort.

As with all our epoxies this is a no wax no blush epoxy

other hardeners available are 7/11 a fast hardener, 16/20 medium hardener and 30/35 a slow hardener

  • Black bear may be injected into voids, holes etc to make a strong water proof repair.
  • Black Bear does not wax or blush.
  • Black bear has a clear to amber appearance it has a typical strength of 1800 - 2200 pounds per sq inch.
  • Black Bear can be stored for more than 12 months.
  • Black Bear along with all our other resins has a high amount of natural ingredients making it the best for moisture exclusion and giving a very low shrinkage when cured.

Storage Life

Black Bear has one of the best storage life spans on the current market it has been blended to remain usable at low temperatures allowing it to flow and not crystal within the container

Where and how to use

Black Bear must be mixed with Black Bear 7-11 , 15-20 or 25-35 hardeners at a rate of 2 parts resin to 1 part hardener , this can be done by volume or weight (we find that small digital scales are the best method)


We use Black Bear Thin Resin in the workshop on any substrate that needs deep penetration end grain of timber or plywood these are the most common that come to mind as well as any glass layup that we are doing a repair to. In many instances we have found that were there has been no gel coat applied (inside of hulls tanks etc) when we have started to grind back we have found pockets were the original layup was not done well and needs filling before we move on to the main repair. Black Bear thin Resin is ideal for penetration and sealing creating a sound base to complete your repair or build.

Coating any surface that needs protecting will benefit from a coat or two of epoxy Black Bear Thin Resin is an ideal coating agent and once cured any paint or varnish system may be used (check with paint manufacturer before use)

When applying cloth, we use Black Bear to wet out the cloth . Black Bear Thin Resin will go through several layers of dry cloth and wick out making the clothing of any area simple and time saving (lay the cloth on dry then apply Black Bear Thin on top of the cloth and it will go through to the substrate)

Black Bear 7-11 hardener

Black Bear 7-11 hardener can be used as an accelerator for Black Bear 30-35 and 15-20 Hardeners when customized cure times are required. Appropriate applications of 7-11 hardeners formulas include hardware bonding, spot filling, and fairing. Additionally, the superior bonding strength of 7-11 hardener mix is ideal for high strength secondary bonding applications such as structural tabbing and repair laminations.

The rapid cure time of 7-11 allows overnight curing in low temperature conditions so your project can be sanded next day

We do not recommend mixing more than 140 grams. of formula unless rapid application techniques are incorporated.

An induction time of 1-2 minutes is recommended prior to application of formula. We have found the low viscosity of 7-11 hardener allows for fast wet-out of the heavy reinforcing fabrics often used in repair applications. 30-35 or 15-20 may be blended with 7-11 to retard the mix of the Black Bear 7-11 hardener when customized cure times are required.

Remember Surfaces coated must be carefully prepared prior to re-coating and bonding dust and grease free and a good scratched key over the whole area to be bonded


Black Bear 15-20 Hardener

Black Bear 15-20 hardener has a moderate gel and thin film set times providing great advantages when filleting and fairing Black Bear resins when mixed with 15-20 hardener and the appropriate thickener will gel and set quickly enough to avoid draining out and sagging, while still giving you the time to get the job done. We recommend this hardener when “overnight” sanding is more important than continuous laminating and open time (as provided by Black bear 30-35 Hardener)

Black bear 15-20 will also provide a beautifully smooth void free finish.

Cure speed gelling and thin film set can be adjusted by adding either 30-35 hardener or 7-11 hardener as needed but the mix must remain 2 parts resin to 1 part hardener

This is our standard hardener that we recommend for all gluing and fairing work , provided the customer is experienced enough and happy to work at a faster rate. However when wetting out multiple thickness of cloth we recommend slow hardener to ensure the epoxy hardener mix has properly wet out before it starts to gel


Black Bear 30-35 Hardener

Black Bear 30-35 hardener is a hardener that will give you a working pot life of 30 – 35 minutes , when used with black Bear thick or thin resin at a ratio of 2 parts resin to 1 part hardener it gives a good extended gel time allow you to control the application

Special features exhibited by this product include blush free surfaces, good ultraviolet stability, smooth finishes in cured films, excellent osmotic resistance, and the ability to cure under high humidity

We recommend 30- 35 hardener when working on large areas and on cloth were we want the maximum amount of penetration before gel starts. 30- 35 can be mixed with our other hardener to get the correct working time for your application

As with all our hardeners 30-35 is blush and wax free there is no need for any wash down between coats (if the surface can be marked with your thumb nail , then you can go straight on top if it can not a simple roughing or abrasion is needed to give a good key)

Use: If you are a beginner to the use of epoxy we recommend that you choose 30-35 hardener, this gives you an extended pot life enabling you to take time on your work and giving you the opportunity to correct any thing along the way. When doing large areas or when large mixes are needed always consider 30-35 hardener first.

Caution: Not recommended for use below 8 degrees C unless cure time is available.

This means that you simple have to give the product longer so if it is below 10 degrees C yes it will work but you have to wait but as a policy we would recommend a quicker hardener the cooler it gets

Remember you can mix 30-35 with any other Black bear Hardener to achieve to work and cure time you want but the mix ratio must remain 2 parts resin to 1 part hardener

Black Bear Boating & Leisure will deliver any paid for goods in the quickest possible way, usual delivery is 2/3 days however were we are sending goods overseas (this means across any water) this period may be extended up to two weeks or longer at the company’s discretion.

The company has an ongoing belief that good customers expect and deserve a top class service.
In the UK, any problem reported to us on delivery will be dealt with in the following manner: