Acetone and Reducer...Difference?

NO. Enamel reducer is a cocktail of chemicals used to reduce the viscosity of enamel paint without affecting its properties.

Resin is a rather generic term. What type of resin is it? Generally it will be either polyester resin or epoxy resin. If it is epoxy resin, use alcohol to reduce it. Not rubbing alcohol which contains water, but pure methyl or ethyl alcohol (denatured alcohol).

In some cases acetone is the catalyst for polyester resin and will cause problems if used as a reducer.

Some polyester resin has a wax in it that will come to the surface when cured. It will need to be sanded to remove the wax before the next coat is applied or you may get separation between the coats. Generally, when applying more than one coat, epoxy resin is preferable.

As Paul said, don't try the other ruducer you already have.

Methyl ethyl ketone peroxide is the standard catalyst for polyester resins (don't EVER get it in your eyes btw - read the warnings and wear protective eyewear! This is NOT paranoia.). Methyl ethyl ketone (MEK) or acetone won't catalyze polyester resin.

Ideally, for laminating you should use a resin system with a viscosity and wetting ability that does not require solvents to thin the system. Though many resins appear to be more viscous than intuition would lead one to believe would be effective, they will still wet out the cloth and substrate well.

When making multiple layered layups with polyester resin, you should get unwaxed resin, which is available from fiberglass supply houses. In which case if you're there, and don't want to use epoxy, you might consider vinyl ester resin which sits between polyester resin and epoxy for mechanical properties.

Mike D

The two different polyester resins are generically know as laminating resin and finishing resin. The laminating resin does not have the wax in it so it will accept fresh resin on top and give proper adhesion. The finishing resin has a wax in it that rises to the surface and helps the resin lay flatter so less sanding and filling is needed. I refinished my Mercury sailboat several times while owned it. The boat shop made sure I got all the right stuff and gave great instructions.

Acetone is the same as "polyester resin cleaning solvent" and will work to thin the resin, but will hamper the curing. We pay way too much sometimes for ordinary, inexpensive chemicals in small containers with fancy names. It pays to look at the small print to see what it contains, then look elsewhere for that chemical. This can apply to a lot of household stuff as well as over-the-counter drugs. Another example is "contact cement cleaning solvent" which is nothing more than laquer thinner (or toluene). Dan

It is highly unlikely that you will get anything with toluene in it any more. That stuff is REAL nasty. Xylene is much safer to use.

I dunno 'bout that . . . got a dozen or so cans of the stuff on the stock shelf.

It looks an awful lot like

Saw it for sale today at Ace Hardware.

I guess I was mistaken when the EPA declared them class 1 carcinogens about