JD VIP Buyers Club
JD on Facebook
Request A Free Catalog

Protect Against Gelcoat Blisters with Interlux Interprotect

Protection is always better than cure and it really does make sense to protect a new boat as well as an older craft. To achieve this protection it is necessary to sheath the hull with a water barrier to seal the surface. This is done over the existing gelcoat. There is no better time to apply an anti-osmosis system than when the boat has not yet been launched. Some boat builders now offer Interlux's Interprotect treatment as part of their production process, so it is worth finding out if this is the case. However, it must be stressed that protective systems cannot stop osmosis once it has started, or prevent it from occurring in poorly constructed hulls. It is important that a full check is undertaken before starting.

Recommended Overcoating Intervals

Min Max Min Max
50°F (10°C) 5 Hours 2 Weeks 7 Hours 9 Hours
60°F (15°C) 4 Hours 2 Weeks 6 Hours 8 Hours
77°F (25°C) 3 Hours 2 Weeks 5 Hours 7 Hours
95°F (35°C) 2 Hours 2 Weeks 3 Hours 5 Hours
Number of Coats

*It usually takes 4-5 coats of Interprotect 2000E/2001E but the final film thickness of 10 mils D.F.T. is more important than the number of coats.

**If you exceed the maximum dry times between coats of epoxy you must sand with 80 grit and apply at least one more coat of Interprotect 2000E/2001E to ensure having 10 mils D.F.T.

***Overcoating times will vary due to wide variations in temperature and humidity. The best method to determine when the Interprotect 2000E is Ready-to-Overcoat is to check the paint film using the "Thumb Print" test. If the Interprotect 2000E feels tacky and you can leave a thumbprint in the paint film without getting any paint on your thumb it is ready for overcoating.

Test the paint film 1 hour after starting the application. Continue testing every 15 minutes using the "Thumb Print" test until reaching the ready-to-overcoat stage. Immediately, begin to apply the Interlux antifouling paint once the primer has reached the Ready-To-Overcoat stage. Do not use this method with Epiglass Epoxy or Interprotect® 3000.

These times do not apply to VC Offshore or Baltoplate, Micron® Optima or Fiberglass Bottomkote Aqua.

Typical work schedule for application of InterProtect® 2000E at 70°F (21°C)

8 a.m. Give boat final sanding and wipe down
9 a.m. Apply first coat of InterProtect 2000E
12 noon Apply second coat of InterProtect 2000E
3 p.m. Apply third coat of InterProtect 2000E

DAY TWO — Up to 6 months is allowed between coats of InterProtect 2000E
8 a.m. Apply fourth coat of InterProtect 2000E
12 noon Apply fifth coat of InterProtect 2000E (if needed)
4 p.m. Apply first coat of Interlux® antifouling paint

It usually takes 4-5 coats to apply the proper amount of Interprotect® 2000E/2001E, but the amount of paint is more important than the number of coats. See page 28 for the amount of InterProtect 2000E needed.

Original article from Interlux (pdf)

Bottom                          Antifouling
     Blister Repair & Prevention

Interlux Antifouling Basics
How Antifouling Paint Works
Interlux Antifoulant Selection Guide
Painting Bare Fiberglass Bottoms
Antifouling Paint Systems for Various Substrates
Handy Specifications
How To Paint Previously Painted Bottoms
Interlux Applying Antifouling Advice
Antifouling Paint Calculator
Antifoulant on Aluminum Hulls
Interlux Antifoulant on Metal Outdrives, Keels and Centerboards
Hints for the Perfect Bottom Finish
Interlux Antifoulant FAQ
What is Osmosis Gelcoat Blistering
How to Recognize and Treat Osmosis Gelcoat Blisters
Protect Against Gelcoat Blisters with Interlux Interprotect
Interlux Gelcoat Blister Repair FAQ

JD on Facebook Live Tech Support JD Customer Photo Gallery Free Catalog