Mix Resin

Posted on Thursday, May 13th, 2010 at 10:48 am

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whats the difference between all purpose fiber glass resin and marine grade?

whats the difference between all purpose fiber glass resin and marine grade or automotive?about how heavy does it dry?and can i mix epoxy or polyurethane to make it more rigid?

There is no distinction between 'all-purpose' and 'marine grade' fiberglass resins.

There is a big distinction between the two types of different resins. They are: polyester and epoxy.

Polyester resin is mainly used in boatbuilding for the construction of boat hulls and superstructures and the repair of them. It is the origin of the phrase 'glass reinforced plastic' or GRP for short. (The resin being the 'plastic' and the various weaves of glass matting used being the 'reinforcement').

Epoxy resin, although it has been around since its development during World War 2 (ahead of polyester) is a vastly more versatile product. It is widely used in modern boatbuilding in the construction, repair and restoration of wooden vessels. As well as a base material in finishing operations underneath polyurethane (ideally) paints and varnishes.

It was used during WW2, in aviation, most famously in the construction of the de Havilland Mosquito.

For the full low-down on the huge subject area of wood-epoxy boatbuilding, see The Gougeon Brothers On Boat Construction.

There is essentially no reason (even economic - as both types are expensive materials) why 'GRP' vessels should not be constructed using epoxies although I have never come across it myself, and I have been in boatbuilding for many years. As indicated, it is mainly used in wooden boat construction as the main, modern 'weather-boil-proof' (WBP) adhesive. (Superseding products such as resorcinol and urea formaldehyde resins).

Glass-reinforcement is used in conjunction with epoxy resin in so-called 'sheathing' operations - where a super-strong, thick and impervious layer of resin, reinforced with a layer of glass, is used to protect particularly vulnerable areas such as coachroofs and the hull below the waterline (and sometimes the whole hull).

It is important to remember to use the correct type of glass matting depending upon which type of resin system you are working with.

Each tiny strand of glass that is used to weave the matting has a 'finish' applied to it in production that is designed to facilitate maximum 'wetting out' - it just means that the resin attaches itself to the glass with maximum adhesion.

For polyester resins, specify a glass matting with a 'volene' finish.

For epoxy resins, specify a glass matting with a 'silane' finish.

Never mix the two types of resin together 'in the pot' as it were - ie: never mix any of the chemicals associated with either system together.

(Although the tool-cleaning agent - acetone - for polyesters can effectively be used for epoxies too).

There is essentially, however, no reason why the two systems should not be combined just so long as one of them has cured when you apply the new one. (You could for example quite acceptably make a repair to a polyester structure using an epoxy resin).

But as I said above, there is no distinction between 'all-purpose' and 'marine grade' fiberglass resins.

Resin is resin.

Take care, for they are all volatile and sensitizing materials which also give off hazardous and inflammable vapours. The most poisonous of which from the point of view of respiration being the 'styrene' in polyester resin - it is used as a monomer: binding the resin molecules into long chains, and is the chemical which gives polyester its characteristic odor.

Hope that clears it all up for you.

Good luck.

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