Cover Up Pinholes?

[freqflyer]

I think it is difference in the types of products we produce, 80% of my moulds are larger than 5’x5’ - when demoulding the part will flex, we use or have used for in mould coating PPG clear, Epifanes clear varnish, Duratec & a host of others. Some work well, just about all clears (quality) ones at least have (flex agents) etc…Don’t get me wrong, I didn’t mean every time it has cracked, just that it has happened.

^^Is it clear in colour?

It looks white in the can but it disappears when painted even with clear. Kind of like how a super light fiberglass disappears when you infuse it over carbon. After all you’re just putting a tiny spec in a little hole

[2talljohn]

I stopped playing that game with pin holes and clear coat. I gel coat every mold before we make a part, lay up, infuse, pull, trim, sand, clear once, and done.

[dpaine]

I stopped playing that game with pin holes and clear coat. I gel coat every mold before we make a part, lay up, infuse, pull, trim, sand, clear once, and done.

I bought the marine gel coat you suggested but have not tried it since I started using MTI hose. I haven’t had any pinhole issues until this last part. It was a large part so maybe I didn’t degas long enough or infused too quickly… I’m not sure. I was going to try and fill the pinholes but when I started really looking the entire part was cover in holes so I scrapped it and will have to try again.

[bryanhaj]

after reading this thread i decided to purchase some loehle wonder-fill so i will post my results later on.

[SLS]

I stopped playing that game with pin holes and clear coat. I gel coat every mold before we make a part, lay up, infuse, pull, trim, sand, clear once, and done.

The you’re running polyester resin or VE?

[datas_br]

Did you have good results?? I couldn’t make it work,after clear coating I still could see pinholes.

I use it regularly and like it. If you know what you are looking for, you will see little black dots at bundle intersections but only if you are specifically looking for them.

@Dominik: where do you get the clear filler? R&G only has black as far as I can tell.

[DDCompound]

You can get the clear filler here: filler clear

[tnt]

I used shoe polish once. I had to spray paint a carbon boat white. I warned him that pinholes might show up. Finally there was a 5x5cm area which had pinholes. The customer went beserk, and demanded a respray. I filled the holes with shoe polish, the customer never noticed.

Herman I found a post where you suggest vinylester for overlays,
Thread: Best Epoxy resins for overlay - “For overlays I like vinylester, for its high Tg at RT cure, and less prone to yellowing than epoxy. Also, there are special (polyester) gelcoats that are less prone to yellowing, specifically for carbon work. (Nord Composites)” Wouldn’t this also suitable for filling pinholes? The only problem I guess will be it’s brown color which may make the carbon wave look a bit of yellow?

[2talljohn]

The you’re running polyester resin or VE?

VE on most parts. PE on parts that are neither structural or take abuse of any kind.

[2talljohn]

You can get the clear filler here: filler clear

Any similar items in the US?

[dpaine]

Any similar items in the US?

Has anyone found this product or something like it in the US?

[GAB981]

You can get the clear filler here: filler clear

I use before this http://shop.r-g.de/en/Paint-Lacquer/Basco-lacquer/BascoFill-Wiping-filler-for-pores-black.html

filler + basco prime are very good to cover pinholes.

[dpaine]

I use before this http://shop.r-g.de/en/Paint-Lacquer/Basco-lacquer/BascoFill-Wiping-filler-for-pores-black.html

filler + basco prime are very good to cover pinholes.

I would like to try that, but cannot find in the US.

[2talljohn]

I just gel coat from now on… I gave up trying to get a pin hole free part through infusion with out gel coat months ago haha.

[DDCompound]

We only have pinholes in 2% of our parts, only if something went wrong.

[dpaine]

I had some issues with pin holes but now I believe they were caused by using Super 77 adhesive spray. Never again will I use that. Combining MTI hose and Camie 373 tacky spray I have not had any issues with pinholes or surface imperfections. I would like a good product to have around just in case there is any issue though.

[2talljohn]

Airtack is a good product to use instead of Camie 373.

[icecoaster]

What exactly do you mean by pinholes? Any photos?

[2talljohn]

[REZCAR]

If the shoe polish method was used, can it be covered with a 2K clear?