Type A polysulfide sealant

[Alphalpha]

I have a friend who works for the airlines who scored me an expired can of type A Proseal.

Here’s a test coupon. It’s about like wood glue, maybe a scosh thicker. It’s jut thin enough to self level but not really run everywhere.

It’s definitely easier to get a thin layer spread out than the type B. Also, the base is bright pink.

 

[fixnflyguy]

I have a friend who works for the airlines who scored me an expired can of type A Proseal.

Here’s a test coupon. It’s about like wood glue, maybe a scosh thicker. It’s jut thin enough to self level but not really run everywhere.

It’s definitely easier to get a thin layer spread out than the type B. Also, the base is bright pink.

 

[fixnflyguy]

Type A is designation for the thickness and has no relation to the make up of or capabilities of the sealant. The color you have posted is one I am not familiar with. Do you have the corresponding identification numbers? There are sealants for many different uses and they aren't all for fuel tanks. The 3M Proseal variants are easily googles to find the spec sheets and application guides. I do my fuel tank sealing with the 1422 or 1440 A and B for the majority of the time.

 

[David Paule]

Type A is usually used not between parts but as a top layer over edges, rivets and so on. These pictures show its uses. I've often used a large hobby syringe to apply it, and a popsicle stick to form it. In the pictures, a mil is .001 inch, so 250 mils is 1/4".





Dave