Glue: Inmar Glue #4515 / Zodiac #7097/ Universal Glue; Poly marine Urethane (PVC) Glue. Do not use Avon Adhesive (one or two part) or Bostik® or other Hypalon or rubber glues. They will not work on synthetic materials.
1. Atmosphere: Glue with humidity less than 70%; and not in direct sunlight; Temp. 64° to 77°F is best.
2. Preparation: Gather rags, glue brush; solvent; timer with second hand or stop watch; make sure all the old glue is cleaned off; get your patch cut out, position noted and marked. It always leaves a neat tidy finish if you tape off the perimeter of the patch area with masking tape to avoid over glue.
3. Mix accelerator and glue thoroughly either now or while waiting between the solvent wipes below. Accelerator is toxic; keep off skin. Keep mixed glue covered (foil or wax paper) when not using.
Pot life is about 1 hour. It may still look liquid, but will have lost effectiveness.
Solvent Cleaning (3 times - to prepare the fabric for a chemical bond with the glue)
4. Scrub both sides (boat and patch or accessory) with MEK on a rag to clean surface. Be careful not to wipe the MEK on areas of the boat or patch that will be seen as MEK will make the fabric sticky and shiny. Use masking tape around the perimeter to minimize this. Wait 5 minutes after the first MEK wash. (time it)
Mix glue and accelerator while waiting, if not done already.
5. Apply two more solvent wipes with 5 minute waiting time (timed) between them. You are preparing the fabric for glue adhesion. Abrading these PVC fabrics is not recommended or necessary.
Glue Application (3 thin layers)
6. Apply a thin glue layer with stiff brush to both sides. Aggressively work it into the fabric with the brush. If it looks too thin, it is probably correct!
7. Wait five minutes (timed) If glue still looks wet, wait longer.
8. Repeat steps 6 & 7 (total of 3 layers with 5 minute open time between)
9. Wait 10 minutes after third layer of glue.
10. Join the surfaces during the next 10 minutes. Start from one edge and slowly lay the patch or accessory down onto the glued area.
Press out all air bubbles and wrinkles from the center to the edges. On deflated boat rub as hard as possible with smooth tool, e.g. the back of a large tablespoon - force air out from between boat and patch. Careful not to scratch the fabric.
For davits and hard based accessories, deflate boat and press through from other side to make sure of adhesion. Wipe off excess glue with solvent.
If over 10 minutes or if glue has spots of white haze the glue has picked up moisture and you should try to "reactivate" it. With a clean rag wet the glue surface with MEK but do not rub the glue off (one quick swipe). Then assemble immediately. Press hard. For accessory on an inflated boat you can rub it down vigorously with a rag. Make sure there is no MEK on the rag when using it to run down the part or patch.
11. Wait at least 48 hours before use.
Chemical bond will continue to strengthen over next 7 days. Don't be tempted to shorten the process. Don't cut this curing time short: your patch could peel off like a Post It note!
12. Pressure test if you want to be sure. Blow it up to full pressure. Leave it overnight.
IMPORTANT GLUING AND SAFETY REMINDERSLOW HUMIDITY AND TEMPERATURE CONTROL
Relative humidity must be less than 70%, preferably as low as 40%.
Temperature 64° to 77°F.
Never fiddle around with these. Bond strength drops very rapidly with heat or high humidity. Take your boat indoors. Don't even think about trying to glue on the dock or near the water or in direct sunlight. Professionals use a specially built, climate controlled room, and still don't attempt to work on a rainy day.
Note: You are using a two-part contact cement. The solvents in the glue must evaporate before assembly. When ready to assemble parts, the glue must not be tacky at all to the finger. It must not have spots of whitish glaze. If so, you may have spread the glue too thick, not waited long enough between coats, or a sudden drop in temperature or gust of humid air may have occurred. Someone may have opened the door, or you may have leaned too close and breathed on it. Plan to stay in the room until finished.
GENERAL TIPS
Mark out your patch or accessory perimeter where it will be glued on. Then use masking tape to tape off the area to ovoid getting MEK or glue on other parts of your boat during the repair process. This takes a little time but is well worth it in the end as the glue is hard to get off the boat after it dries and looks very messy when it dries and goes brown from the sun.
If using small cans ( 1/4 L) mix the entire can with the dose of accelerator. Inaccurate measurement will weaken the glue. Once opened the accelerator cannot be kept. Do not try to save it. The quality of your final bond depends on it.
Apply glue with a paint or glue brush with the bristles cut short (1/2 to 3/4") so they are stiff. It must be natural hair (i.e. OK for lacquer); bound in metal not plastic; preferably with wooden or metal handle. Careful not to get glue on areas of your boat besides the repair area.
Old glue must be completely removed -- solvent, sandpaper, scraping, grinding with a Dremel tool. Glue will not stick to old glue. Clean it off thoroughly. Be careful not to burn or melt the fabric if using a Dremel tool. Constant motion with the tool will prevent this problem.
If your boat has ever been protected with ArmorAll® or another silicone or petroleum based product, you may have great difficulty getting a bond. Wipe the repair area well with MEK, follow the gluing instructions closely and hope for the best.
Pinhole size leaks in most Hypalon fabric or PVC boats sometimes may be repaired simply by use of either Seam Sealor Air Seal liquids. You might be able to avoid a patch on the boat.
To find tiny leaks, take floor boards out, inflate boat hard. Put some liquid detergent in a bucket of water and with rag or big wash brush, scrub it all over boat. Keep watch for elusive, tiny bubbles. When you find the first leak, keep looking. You might as well fix them all at the same time! Remember, the number one cause of slow leaks is a poorly seated valve. Unscrew, clean. Make sure little rubber O-rings are good. They are the cheapest repair possible.
If patching, cut patches 1 to 2 " larger than tear in each direction and round the corners (a quarter makes a good template for the edges). Little one inch circles pasted over a pin hole won't last. Try to get the same fabric used by the manufacturer for your boat. The inside and outside surface may be different. If you can't match color, sometimes a cleverly shaped patch in contrasting color can be made to look like decoration instead of a Band-Aid. e.g. arrow, lightning bolt, even a new D ring if in right spot. Professionals often put one on each side to look like they came with the boat.
Inflate boat to apply accessories. Deflate to patch air leaks, even if very small. Air pressure will bubble the patch before glue sets.
BE SAFE
Do Not Smoke! Glues and solvents are flammable. No open flames (e.g. furnace or pilot light when working in a cellar.)
Use in a well ventilated area. Fumes can be overwhelming. A carbon filter respirator is recommended. MEK solvent smells, but is relatively safe. It is recommended that you not use Toluene - the factories do but it is quite dangerous.
Accelerator (small bottle) is toxic. If spilled on on your skin WASH IMMEDIATELY with soap and water. If in your eyes, IMMEDIATELY FLUSH WITH WATER for at least 2 minutes and consult a physician. (Accelerator is an isocyanate based product.)
Always wear safety gear as recommended by the manufacturer of glue, solvent, accelerator, etc.
NOTE: These instructions are offered to assist you in home use of glues. Because of the wide variety of conditions and critical procedures, we. assume no responsibility for failure of glued bonds or any consequence thereof. We always recommend repairs be done by trained professionals. If you mess it up, it's costly time to clean the fabric and rectify the problem and it can greatly exceed the cost of the original repair.
We offer do offer complete service and repair if needed. Sometimes it is easier to allow the professionals to get your boat back on the water quickly. Just give us a Call.
