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Interlux Interfill 830

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Interfill 830

A Lightweight Epoxy Profiling Fairing Compound used for profiling above and below the waterline on Steel, Aluminum and Composite.

Interfill 830 is the PREMIUM choice of profiling fillers for professional applicators. It has been extensively tested in our laboratories and in the field to the most exacting standards. High expectations and stringent industry requirements have made Interfill 830 one of the most popular fairing compounds in the world.

Interfill 830 is available in both fast and standard cure versions to provide maximum flexibility for application in a variety of conditions.

Part No.

Description (Click to view & order)







Interfill 830 is the best choice for profiling above and below the waterline on Steel, Aluminium and Composite hulls. The special 2-component light grey epoxy formulation can fill up to a thickness of 1 inch in one coat without the risk of sagging/slumping.
* Low density composition
* High strength and impact resistance
* Easy sanding
* Waterproof
When sanded, the surface of the Interfill 830 is smooth enough to be directly overcoated with Interprime 820 high build epoxy primer. Interprime 850 or Interprime 880 may also be used. Interfill 830 is particularly suitable for application over large areas.

Colour YAA867-Grey
Finish Matt
Specific Gravity 0.75
Volume Solids 100% 
Mix Ratio 1:1 by volume (as supplied) Mix ratio by weight: 1.15:1 YAA867: YAA868, Converter/Curing Agent - YAA868
Typical Shelf Life 2 yrs
VOC (As Supplied) 1 g/lt
Unit Size 5 Lt 20 Lt



10C 15C 23C 35C

Sandable 48hrs 28hrs 19hrs 13hrs
Pot Life 75mins 55mins 45mins 20mins

Substrate Temperature
10C 15C 23C 35C
Overcoated By Min Max Min Max Min Max Min Max

Interfill 835  5days  -  3days  -  2days  -  1days  -
Interprime 820  5days  -  3days  -  2days  -  1days  -
Interprime 850  5days  -  3days  -  2days  -  1days  -
Interprime 880  5days  -  3days  -  2days  -  1days  -

Note:Once the sandable time has been exceeded, all fillers should be sanded before overcoating to promote good adhesion. A sanded filler may be left for a period up to 3 months before being overcoated with further epoxy filler or with Interprime 8-series. After 3 months the filler must then be re-sanded before overcoating.

Preparation All substrates must be primed, clean and dry.
In Good Condition: Wash down with Yacht Line Super Cleaner, rinse with fresh water and allow to dry. Sand with 80-180 grade (grit) paper.
In Poor Condition: Remove all previous coatings and prime the substrate.
STEEL/ALUMINIUM: Prime with Intergard 269 or Interprime 820.
BARE WOOD: Prime stable constructions only, with Interprime 820.
GRP: For osmosis treatment follow the Gelshield specification ensuring the Interfill 830 is only used during STAGE 2.
BARE GRP/COMPOSITE: Sand with 80-180 grade (grit) paper.
If left for longer than 24 hours, two component epoxy primers and fillers will need sanding with 80-180 grade paper to ensure a good physical key.:

Method Mix the two components thoroughly to an even color. Remove any dust from the surface. Apply firmly in a spreading action. When hardened, sand smooth with 80-180 grade wet or dry paper. Interfill 830 may be overcoated with itself or with Interfill 833 as soon as it is cured enough not to be lifted during the screeding process.

Hints Thinner GTA220 for equipment cleaning only.
Thinning Do not thin.
Ventilation and Humidity Control Avoid conditions of low temperatures coupled with high humidity as this can result in the formation of a surface by-product which will need to be removed by detergent wash followed by fresh water rinse, or by sanding, prior to the application of any subsequent layers.
Other Spread mix out on a board to avoid excess heat build up and to keep the working life as long as possible. When fairing a hull, two or three 'cross coats' of Interfill 830 will ensure the desired shape is obtained. Where large areas have been faired, sand with a longboard to allow for the curvature of the hull.

Some Important Points Do not use unless mixed thoroughly with the curing agent at specified ratio. Do not apply more than recommended WFT at any one time. Do not use below 10C/50F. Do not thin. Do not wipe down cured filler with thinners/solvents. Substrate temperature should be minimum 10C and maximum 35C. Product temperature should be minimum 10C and maximum 35C. Ambient temperature should be minimum 10C and maximum 35C.

Compatibility/Substrates Do not use on traditional wood constructions where the wood will expand and contract through changes in the moisture content. Interfill 830 should be applied over cured epoxy primers or fillers or onto cured GRP/Composite. Interfill 830 may be overcoated with Interfill 833, Interprime 820, Interprime 850, Interprime 880 or Interfill 835 (YAA855/YAA856). Gelshield or Gelshield 200 may be used over Interfill 830 within the osmosis schemes.

Number of Coats As required

Coverage (Theoretical) - 0.20 (m/lt) @ 5000 micron (800 mil) WFT.

Recommended DFT 20000 microns dry By Trowel or Batten.
Recommended WFT 20000 microns wet By Trowel or Batten.

Application Methods Trowel, Batten

Exposure to air and extremes of temperature should be avoided. For the full shelf life of Interfill 830 to be realised ensure that between use the container is firmly closed and the temperature is between 5C/40F and 35C/95F. Keep out of direct sunlight.
Interfill 830 should be kept in securely closed containers during transport and storage.

Safety GENERAL: Read the label safety section for Health and Safety Information, also available from our Technical Help Line.
DISPOSAL: Do not discard tins or pour paint into water courses, use the facilities provided. It is best to allow paints to harden before disposal.
Remainders of Interfill 830 cannot be disposed of through the municipal waste route or dumped without permit. Disposal of remainders must be arranged for in consultation with the authorities.

DISCLAIMER The information given in this sheet is not intended to be exhaustive. Any person using the product without first making further written enquiries as to the suitability of the product for the intended purpose does so at their own risk and we can accept no responsibility for the performance of the product or for any loss or damage (other than death or personal or injury resulting from negligence) arising out of such use. The information contained in this sheet is liable to modification from time to time in the light of experience and our policy of continuous product development.
Performance Yacht Systems
919 Bay Ridge Road
Annapolis, MD  21403

Toll free: 1-877-379-2248
Local: (410) 267-8681


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