Alternative to screws? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 05-11-2004
Someday...
 
Join Date: Mar 2004
Location: NC, USA
Posts: 52
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
ilnadi is on a distinguished road
Alternative to screws?

I am trying to add hardware to a rotomolded polyethylene boat (Escape Mambo). Does anybody have a suggestion for alternatives to self-tapping screws?
Reply With Quote Share with Facebook
  #2  
Old 05-11-2004
Senior Member
 
Join Date: Dec 2002
Posts: 552
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
GordMay is on a distinguished road
Alternative to screws?

Sorry to say, I know of nothing that will stick to Polyethylene (bonding, bedding, or sealant).
If anyone does know of something, I''d be VERY interested.
Gord
Reply With Quote Share with Facebook
  #3  
Old 05-11-2004
Senior Member
 
Join Date: Mar 2000
Posts: 119
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 15
geohan is on a distinguished road
Alternative to screws?

GordMay:

I tend to get the poly--plastics mixed up so it may not have been polyethylene but hot melt glue made a four-year repair on the bottom of a "Sportyak" plastic dingy. After application with the heat gun I carefully but thoroughly fused and smoothed the patch to the parent material with a heated (soldering temperature) 2# soldering copper. I say carefully as it is very easy to melt all the way through.

Regards, George
Reply With Quote Share with Facebook
  #4  
Old 05-11-2004
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,796
Thanks: 9
Thanked 68 Times in 61 Posts
Rep Power: 15
RichH will become famous soon enough
Alternative to screws?

Go to a (snow) ski shop and purchase some "P-tex" candles. These are used in repair of polyethylene ski bottoms. There is a ''trick'' in using them to avoid soot by working fast and not allowing a large flame to develop. You ''light'' them with a match and dribble the molten polyethylene into the repair. If you are not close to ''ski country'', do a websearch for "montana + Ptex".
There is also a ''welding'' grade available (1/8" dia.) that requires a heat gun.
Reply With Quote Share with Facebook
  #5  
Old 05-12-2004
Senior Member
 
Join Date: Dec 2002
Posts: 552
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
GordMay is on a distinguished road
Alternative to screws?

As the original question implies; screws are not recommended hardware fasteners in for Poly’ applications.

I’ve used Blind Rivets and Gaskets, with moderate success. If you have access to the “blind” side of the hull/deck, you would be better off using Nuts & Bolts (in lieu of rivets).

Drill out the hull for a slightly snug fit (rivet or bolt diameter).
Clean the area to be covered by the hardware (footprint) with alcohol.
Apply a plastic gasket (ie: Silicone Sealant, or other) to both the hull (hardware footprint) & the hardware.
Fit the hardware to the hull while gasket is still pliable; hold in place (the challenge) until gasket sets. Do not squeeze out the gasket. The Silicone gasket will not adhere to the Poly’ - it’s just a flexible gasket that will “seal” the holes due to mechanical clamping (compression) pressure.
Apply the rivet(s) through the hardware (mounting holes) and the hull (holes). The efficacy of this method relies on a continuous compressible gasket, and the clamping pressure of the rivet or nut/bolt.

You might finish the mounting by applying (Hot-Melt) a bead of RichH’s “P-Tex” (or Polyethylene “Welding Rod”) along the edge of the harware and hull junction.



Some reference reading:

GUIDE TO ROTOMOLDED KAYAK & CANOE REPAIR:
http://www.voyageur-gear.com/downloads/care&repair/Polyethylene_Repair_Guide.pdf

Linear Polyethylene: Repair using heat
http://www.polyprocessing.com/pdf/technical/RepairRotomoldedPolyethyleneParts.pdf

Good luck,
Gord
Reply With Quote Share with Facebook
  #6  
Old 05-12-2004
Someday...
 
Join Date: Mar 2004
Location: NC, USA
Posts: 52
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
ilnadi is on a distinguished road
Alternative to screws?

I had not thought of bonding. I had a polyethylene sailboard ~20 years ago and happened to work in a place that had plastics engineers. The official way to bond included mixing two chemicals (both of which were labeled toxic and non-shippable) for 8 hours! I have used p-tex to repair skis but I did not think it would bond a metal part to a deck strong enough to resist pulling apart. Having said all that, I''ll check out the links. I also asked the manufacturer. I''ll update what they say.
thanks
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Loose screws bmcald Gear & Maintenance 13 05-29-2002 11:57 AM
Sandblasting alternative? lee_1999 Gear & Maintenance 6 05-03-2002 05:48 AM
interior-oak strips evecircleM Gear & Maintenance 2 02-27-2002 07:42 AM


All times are GMT -4. The time now is 11:23 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.