Model Boat Mayhem

Technical, Techniques, Hints, and Tips => GRP & Epoxy => Topic started by: bruce74 on June 12, 2012, 04:07:46 pm

Title: Glass fibre on glass fibre.
Post by: bruce74 on June 12, 2012, 04:07:46 pm

hello all

I want to slightly reshape an old fibre glass hull i built years ago. I have sanded of all the old paint so that is back to just the fibre glass. I then have made the surface rough to act as a key Would it be OK now just to add a few more layers of fibre glass,

thanks bruce74.

Title: Re: Glass fibre on glass fibre.
Post by: Subculture on June 12, 2012, 04:21:49 pm

Yes. Make sure the surface is well keyed though.

Title: Re: Glass fibre on glass fibre.
Post by: unbuiltnautilus on June 12, 2012, 04:59:13 pm

Somebody suggested a quick wipe with Acetone first, or did I imagine it?

Title: Re: Glass fibre on glass fibre.
Post by: Subculture on June 12, 2012, 05:59:46 pm

CAn't hurt, not sure I'd bother though if the surface has been well abraded first- the bond will be mechanical rather than chemical.

Title: Re: Glass fibre on glass fibre.
Post by: triumphjon on June 13, 2012, 08:31:17 am

acetone can soften the original resin , thus helping new resin to chemically bond ,

Title: Re: Glass fibre on glass fibre.
Post by: craig dickson on July 27, 2012, 05:23:47 pm

Hi Bruce
You should be fine with a sanded surface assuming it is free of contaminants such as any grease or oil.
Acetone is a powerful solvent however if you do use it be careful as to what you use to rub it on with. If you apply it with a rag that has been washed, with some clothing softeners, the invisible residue in the cloth can be dissolved into the acetone and left on the surface of the hull causing contamination that can affect the bond.
Also if applying with rags that have any synthetic components the same can occur. Applying it with white kitchen paper should prevent these potential issues.
Cheers
Craig

Title: Re: Glass fibre on glass fibre.
Post by: lamedos on October 24, 2012, 08:01:11 pm

i used Acetone and it made the GRP very soft so do it with caution

Title: Re: Glass fibre on glass fibre.
Post by: tmbc on October 25, 2012, 03:21:35 pm

Quote from: craig dickson on July 27, 2012, 05:23:47 pm

Hi Bruce
You should be fine with a sanded surface assuming it is free of contaminants such as any grease or oil.
Acetone is a powerful solvent however if you do use it be careful as to what you use to rub it on with. If you apply it with a rag that has been washed, with some clothing softeners, the invisible residue in the cloth can be dissolved into the acetone and left on the surface of the hull causing contamination that can affect the bond.
Also if applying with rags that have any synthetic components the same can occur. Applying it with white kitchen paper should prevent these potential issues.
Cheers
Craig

agree with craig use kitchen roll to ensure no cross contamination ! oh and in a well vented area unless u like a floaty feeling  {-) {-)

Title: Re: Glass fibre on glass fibre.
Post by: scoop on October 29, 2012, 12:52:32 am

Styrene (if you can get hold of any) is the best solvent for cleaning fibreglass but it must be handled with extreme caution, use sparingly, a little goes a long way with this stuff. Thick rubber gloves must be used, marigolds or vinyl/latex gloves are no use at all.
A well ventilated area is a must, best used outside.  :-))
 
Regards
Scoop