SailNet Community - Reply to Topic

   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 > Do I have to predrill before running screws into fiberglass
 Not a Member? 


Thread: Do I have to predrill before running screws into fiberglass Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
08-06-2013 01:11 PM
abrahamx
Re: Do I have to predrill before running screws into fiberglass

I'm not done yet but I am filling the old ones and drilling new ones. I'll reuse the through hole winch holes. I filled all my handrail holes. I did not take them off myself and after reading "this old boat" it says hand rails must be through hole bolts. I'm not sure if mine were or not. If they were I probably would have reused the holes although this old boat says to make new ones.
08-05-2013 09:16 PM
rndmtrvlr
Re: Do I have to predrill before running screws into fiberglass

What if you are replacing wood. Is it recommended to re-use the original screw holes (any preparation required?)? Or should I fill the holes and drill new ones?
08-02-2013 05:47 PM
jfdubu
Re: Do I have to predrill before running screws into fiberglass

If you are trying to use a larger drill bit as your chamfer tool you may end up with a bigger hole. Most drill bits are made to pull in so when you try to just "kiss the edge the drill pulls itself in. Sometime running a larger bit in reverse works but I learned the hard way that on fiberglass/gelcoat a chamfer bit is the only way to go.

my 2 cents

John
08-01-2013 10:47 PM
jimgo
Re: Do I have to predrill before running screws into fiberglass

Something like these should do the trick:

3-In-1 Hex Bit Countersink Tool

Countersink and Deburring Tool Set
08-01-2013 10:33 PM
abrahamx
Re: Do I have to predrill before running screws into fiberglass

Thanks, I did not know there was such a thing.
08-01-2013 10:16 PM
benesailor
Re: Do I have to predrill before running screws into fiberglass

I'll add:

Using a large drill bit for a chamfer bit does work, but, doesn't leave a nice chamfer. Invest in a chamfer bit or use a router bit(in a drill).
08-01-2013 08:43 PM
fryewe
Re: Do I have to predrill before running screws into fiberglass

Quote:
Originally Posted by paul323 View Post
If you drill through gelcoat - perhaps not in your case - start off by drilling in reverse. Reduces the likelihood of chipping.
This is a good tip. After drilling the small hole in the glass use a non-pilot bit whose size is about the size of your chamfer and - with your drill in reverse - start the chamfer by smoothing the edge of the hole before using the countersink/chamfer bit. If your large bit has the appropriate face angle you may be able to complete the chamfers with the bit eliminating the use of the chamfer bit (and higher potential for chipping the gel coat).
08-01-2013 05:57 PM
leogallant Predrill all the holes first through the wood and the fiberglass. Then pull the wood off and then chamfer the fiberglass holes.
08-01-2013 01:55 PM
paul323
Re: Do I have to predrill before running screws into fiberglass

If you drill through gelcoat - perhaps not in your case - start off by drilling in reverse. Reduces the likelihood of chipping.
08-01-2013 01:47 PM
MarkSF
Re: Do I have to predrill before running screws into fiberglass

Which wood are you replacing?

As a general rule, horizontal deck surfaces are usually cored, and vertical surfaces are not. I'm sure there are many exceptions to this rule.
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 10:34 AM.

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.