Adhesion Promoter

Should I use an adhesion promoter as the first coat/primer on fiberglass? Planning on using all duplicolor rattle can products. If needed can regular primer be sprayed over the promoter?
Wayne

kzz1king wrote: Should I use an adhesion promoter as the first coat/primer on fiberglass? Planning on using all duplicolor rattle can products. If needed can regular primer be sprayed over the promoter?
Wayne

Adhesion is more for metal. If you have sanded to a 400 grit then sandable primer is fine for fiberglass.

If you'll be spraying down LAQUER based primer. (most rattle can primers that are sandable are laquer based.) Use light coats. The thinning agent might attack the glass or any old paint.

depending on what type of resin was used in the composite, and if it was allowed to cure open to the air, it may be necessary to remove the outer layer as it does not fully cure unless treated in some instances. adhesion promoter helps adhesion, but is not necessary. do you know what type of resin was used? a helpful indicator is the type of fiber that was used in the composite.

I will lok at the can. It is a Bondo product found in O Riely's and Walmarts.. It has been sanded.
Wayne

DoctoRot wrote: depending on what type of resin was used in the composite, and if it was allowed to cure open to the air, it may be necessary to remove the outer layer as it does not fully cure unless treated in some instances. adhesion promoter helps adhesion, but is not necessary. do you know what type of resin was used? a helpful indicator is the type of fiber that was used in the composite.

kzz1king wrote: I will lok at the can. It is a Bondo product found in O Riely's and Walmarts.. It has been sanded.
Wayne

DoctoRot wrote: depending on what type of resin was used in the composite, and if it was allowed to cure open to the air, it may be necessary to remove the outer layer as it does not fully cure unless treated in some instances. adhesion promoter helps adhesion, but is not necessary. do you know what type of resin was used? a helpful indicator is the type of fiber that was used in the composite.

adhesion promoter is used on STEEL :huh: .......IMO, a good sealer/primer should be fine for your paint job...apply lightly for the first 2 or 3 coats and let flash between coats..... :ohmy: light coats will keep the resin used in making your body work from being attacked/softened by the thinner/reducer used in the rattle can. :blink:

Yes, adhesion promoter is used on plastics like new car bumpers and side panels.
First of all what are you fixing? Are you painting your KZ parts? Other Motorcycle parts?

Good old laquer is what I used to use. Until the tree hugger police are trying to eliminate it.
Hope you don't live in California, suprised they are not trying to ban aerosal cans :laugh:

But nowadays, 2 part epoxy primer and urathane primers are the way to go. But this is spray gun material.
Go get your self some Krylon primer and load it up wet so you can wet sand it. whatever your painting.

z1kzonly wrote: Yes, adhesion promoter is used on plastics like new car bumpers and side panels.

i have only heard of it used on plastics as well. there are much better primers available for metal than adhesion promoter. like self etching and epoxy primers.

If you sanded it you are good to go! I have parted molds before and had poor adhesion with paint because the outer layer was not treated chemically or mechanically. This is a characteristic of orthophthalic resins and other polyester resins.

I plan on using Dupli color products, So is there a type of primer I can use for both the tank and the fiberglass seat? Self etching the way to go?
Wayne

DoctoRot wrote:

z1kzonly wrote: Yes, adhesion promoter is used on plastics like new car bumpers and side panels.

i have only heard of it used on plastics as well. there are much better primers available for metal than adhesion promoter. like self etching and epoxy primers.

If you sanded it you are good to go! I have parted molds before and had poor adhesion with paint because the outer layer was not treated chemically or mechanically. This is a characteristic of orthophthalic resins and other polyester resins.

Self etching primer is like an acid wash to metal.
It is only for bare metal! Then you use your sandable primer on top of it.
Find a person with a compressor and a spray gun give him 25 bucks just to prime it for you.
Then use your rattle cans. Or.
Just use Krylon gray primer on it all.