# 2 making a fibreglass mould using optimold tooling resin

This is the second in a series of three videos demonstrating how to make a GRP mould using optimold low shrinkage tooling resin.
www.ecfibreglasssupplies.co.uk

[@ecfibreglassuk]

Its just a matter of preference, lots of companies spray on gelcoats which benefit production on a large scale for example boat hull moulding, we find that moulds or jobs of this size that we can apply a gelcoat faster than it would take to set up and clean the spray gun, also it cuts down the energy costs of running compressors. If a product requires a strict thickness of gel this would also warrant the use of a spray gun, we actually supply a low maintenance sprayer the G100. rgds ecfibre

[@ecfibreglassuk]

Hi, It is important to use the gelcoat as this will prevent exposure of the fibres, deterioration of the mould surface, eliminate pinholes and give a surface which can be rubbed to a smooth Finnish and buffed to a shine. Unfortunately i am limited by youtube character count but you can visit our website shown at the end of this video then click on projects and scroll down to making Moulds this will give you some interesting literature on the full process. Kind rgds ecfibreglassuk

[@ecfibreglassuk]

A melamine faced board is best to use for any flat areas as the gelcoat and fibreglass release quite well from this, just a light wax and buff of mould release wax is required on this type of board, we use duratec suface primer to seal our timber plugs then coat with release agent as demonstrated, glass can be used but must be waxed a few times first. most plastics should be coated with several coats of PVA release agent to protect them agianst melting from the styrene in the polyester resin.

[@ecfibreglassuk]

A 2-3inch (50mm - 70mm) overlap is usually sufficient although if applying multiple layers of fibreglass it is better if you can butt joint the glass and make sure that the joints on following layers are in a different place each time.

[@ecfibreglassuk]

the 14PA we use is designed for brush application - usually thinning gelcoats down with styrene to make them sprayable leads to higher shrinkage and more tendancy to pre release. Viny ester gelcoats contain more styrene compared to conventional Iso or Iso / NPG types so can be more likely to pre release particularly if applied too thickly in corners etc. Rgds ecfibreglassuk

[@TekkHakk]

Good video good info :)

[@ecfibreglassuk]

song by Mark Ransom Song:Stride Album:Stride rgds ecfibreglassuk

[@almirlima07]

Muito legal o trabalho

[@mr.technical1008]

what is the different between polyster,gelcoat,epoxy resin?

[@ecfibreglassuk]

@chittychad18 Hi This is not a part this is the process of making the actual mould from a plug Kind rgds martin

[@DILUSI]

hey whats a good work table to build the mold on.. could wood be used, plexy glass, glass? great vids by the way

[@robotmotor]

please help i use gelcoat but he make brush marks ?!! waht i will do ?

[@OPUSHAK]

Hi lads, I'm on a project of building a bicycle frame. I decidet to make a model of bike, and then make a mould as described in your compilaton of videos. (I'd make two halfs of mold - later this would became 2 half base out of carbon fiber, in which I'd later add some more layers of carbon). However I'd need some advices how to make a proper mold. Should I use gelcoat? by the way, your videos are very usefull!

[@ecfibreglassuk]

Hi again, Using Scott Baders 14pa Tooling Gelcoat and leaving it to harden at the recommended timescale fibre print through is non existent, using a good quality (Owens corning) 300g matt m705 grade is a lot easier to work with and forms a better bond to the Gelcoat than surface tissue. On the latest video it shows this actual mould in production, no evidence of any print through on gelcoat and over a couple of thousand lifts successfully. hope this helps explain, have a good day.

[@5006944]

nice work . well you please tell me what kind of glue you use on fiber mat.

[@kingoftheput]

Could you please tell me the full name of gel coat you use. And name of factory that produce it. (I can't find it in stores in my country so I could try to find it on online stores). And what do .you use to prevent gel coat to stick on mould. Thank you

[@ecfibreglassuk]

This is Optimould tooling resin. best rgds

[@tomiboykitt]

whats the song?

[@ecfibreglassuk]

HI We have these available in our online store please see website address at the end of this video or click the link on our channel. on the website you will find these in section - ancillary items - containers and mixing - catalyst dispensers. Kind rgds ecfibreglassuk

[@chittychad18]

shouldn't you be adding fiberglass to the inside of the mold? with the mold layer you kinda just made the part bigger...

[@ecfibreglassuk]

Hi, you can use either Polyester Resin / Gelcoat or Epoxy / Resin Gelcoat , the chemistry is different between Polyester and Epoxy. hope this helps