Sanding my parts and it's looking like this? How to fix?

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Sanding my parts and it's looking like this? How to fix?

Author	Message
deceased10	deceased10 posted 9 Years Ago HOT Topic Details
Group: Forum Members Posts: 29, Visits: 154	Sanding my parts and it has like a billion low spots to it. Any idea why it is doing this and how to fix?
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Sand, spray clear coat, repeat.
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carbonfibreworks	carbonfibreworks posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 292, Visits: 4.5K	You could also use the EC skinning resin and this will give the parts a thick coat of clear then flat and clear-coat. Chris
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deceased10	deceased10 posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 29, Visits: 154	So is this normal then? Or is that a sign of sanding through to the carbon fibre? I put two thick coats on
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deceased10	deceased10 posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 29, Visits: 154	So is this normal then? Or is that a sign of sanding through to the carbon fibre? I put two thick coats on
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	I'm assuming this part is skinned? 100% normal for parts not made in a mould.
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Fasta	Fasta posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	You have not said what your process is so far? Looks like a wet layup and maybe one further coat of resin? If you are spraying with a 2 part paint then this is usually very thin and you would need lots of coats to fill the surface well. But to make lots of coats it can run easy too so you need a fast tack paint to keep applying coats. Or use duratec sunsheild which can be much thicker depending on how much thinners you use. It also re-coats fast and does not run so easy either. Or you could have used a specific brush coating epoxy resin first to fill the weave before switching to any other clear top coats as mentioned. Fastacraft Facebook page Edited 9 Years Ago by Fasta
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deceased10	deceased10 posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 29, Visits: 154	Sorry should of mentioned that. This is a skinned part. I am using west systems epoxy 205 resin 207 hardener. I did 1 coat, sanded with 120, then added a second thick coat, wet sanded 120 then 400. So should I add another layer or keep sanding?
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Shaneer22	Shaneer22 posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 156, Visits: 14K	I wouldn't use west for skinning parts,from my experience,your better off using sp 320.
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Hanaldo	Hanaldo posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Nothing wrong with West System for skinning. There's better resins for sure, but it's ok for the price. Deceased, add another coat of resin now. Then flat it down with 120 until the low spots are gone or almost gone. If you bite into the fibres are all, stop straight away. Then do one more coat of resin. Flat this down with 400. Then you can either proceed through the wet sanding stages before compounding, or clear coat.
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