Jump to content

thinning polyester resin?


Recommended Posts

I'm trying to fill a screw hole in a fibreglass dinghy hull which has pulled out. I want to fill it and then retap. I'm trying to use polyester resin for that, but it's too thick to run into the hole properly without drilling it out further. So... can I think the resin? Should I drill out the hole? Use something else entirely? I don't have access to the back so the threads need to bite, can't bolt through.

Link to post
Share on other sites

Trying to remember what we used 30 years ago for thinning polyester , it was the same stuff you put in to stop it being sticky once gone off  …zylene ?    Or something similar sounding . It was called “wax” on the factory floor 

Link to post
Share on other sites

Better use epoxy & heat to thin. Dab in with a  brad. Heat gun sparingly to drive air out or use a mini syringe pushing to bottom withdrawing as you fill. Styrene  <10% with Pe. sh*t filler tho compared to epoxy. Waxed styrene is to make PE sandable. stop air retarding top layer allowing it to cure. Styrene without wax is solvent/thinner only~Used to use it for thinning PE when surfboard fins were laminated on with rovings. NZ fibreglass has styrene monomer.

 

Link to post
Share on other sites

Must be a small hole, poly is pretty runny but what Id do is drill the hole out and make sure its nice and rough then mix catalysed resin with some glue powder and fill the hole as per normal. It's hard to catalyse small amounts, make sure you measure it accurately. 

Link to post
Share on other sites

Drill a really big hole , slip a plywood piece behind it and glue in place  ( use a piece pf string to pull forward and apply pressure. Then fill the hole anyway you want.

 

Or drill a big hole and install an inspection port.

Link to post
Share on other sites

Yes it is styrene used to thin. You can cheat by using Polyester liquid resin mixed into the filler. But Epoxy works even better.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...