roof and gutters

[hotrod]

By the sound of it you used a gp polyester resin (that you added a catalyst such as MEPK to)

"Epoxy laminating resins exhibit high performance characteristics when compareds with polyester resins. The type of epoxy governs the mixture ratio with a prescribed hardener to activate the curing time. Epoxy resins are a specialised system that are generally regarded as expensive if the use of polyester resin is satisfactory"
While it is common to associate polyester resins and epoxy resins, their properties are sufficiently different that they are properly treated as distinct materials. Polyester resins are typically low strength unless used with a reinforcing material like glass fibre, are relatively brittle unless reinforced, and have low adhesion. Epoxies, by contrast, are inherently strong, somewhat flexible and have excellent adhesion. However, polyester resins are much cheaper.

Epoxy resins typically require a precise mix of two components which form a third chemical. Depending on the properties required, the ratio may be anything from 1:1 or over 10:1, but in every case they must be mixed exactly. The final product is then a precise thermo-setting plastic. Until they are mixed the two elements are relatively inert, although the 'hardeners' tend to be more chemically active and should be protected from the atmosphere and moisture. The rate of the reaction can be changed by using different hardeners, which may change the nature of the final product, or by controlling the temperature.

By contrast, polyester resins are usually made available in a 'promoted' form, such that the progress of previously-mixed resins from liquid to solid is already underway, albeit very slowly. The only variable available to the user is to change the rate of this process using a catalyst, often Methyl-Ethyl-Ketone-Peroxide (MEKP), which is very toxic. The presence of the catalyst in the final product actually detracts from the desirable properties, so that small amounts of catalyst are preferable, so long as the hardening proceeds at an acceptable pace. The rate of cure of polyesters can therefore be controlled by the amount and type of catalyst as well as by the temperature.

[ben]

polyeser will adher but not too flash. i pulled off some polyester off a van that dint crack off metal for 10 years?? thats pretty good going:)

i still wouldnt recommend polyester thou

ben

[Bas / NZ]

Hmmm..Dont know, why??
Ill ask him...whats the diff?

Polyester has a higher wax content, will still stick to metal, but not as good. Your main conern is to cover all metal inside with reasin, if no air can get in metal can't rust, that is saying you removed all the rust first.............

[Poochimama]

Hmmm.GOOD Idea bazman! Shall do!
Thanku

[rizzo]

Hi there cords would you have 2 roof ribs for swb the idiot cut through mine when he did the pop top thanks rizzo

[cords]

sorry mate my last spear pair went to van wolf try rob at bedford manor he will post australia wide 0402989175